[OpenACC] Implement data construct 'at least 1 of ... clauses' rule

All 4 of the 'data' constructs have a requirement that at least 1 of a
small list of clauses must appear on the construct. This p

[OpenACC] Implement data construct 'at least 1 of ... clauses' rule

All 4 of the 'data' constructs have a requirement that at least 1 of a
small list of clauses must appear on the construct. This patch
implements that restriction, and updates all of the tests it takes to
do so.

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[OpenACC] Implement 'use_device' clause AST/Sema

This is a clause that is only valid on 'host_data' constructs, and
identifies variables which it should use the current device address.
From a Sema p

[OpenACC] Implement 'use_device' clause AST/Sema

This is a clause that is only valid on 'host_data' constructs, and
identifies variables which it should use the current device address.
From a Sema perspective, the only thing novel here is mild changes to
how ActOnVar works for this clause, else this is very much like the rest
of the 'var-list' clauses.

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[OpenACC] Implement 'delete' AST/Sema for 'exit data' construct

'delete' is another clause that has very little compile-time
implication, but needs a full AST that takes a var list. This patch
ipml

[OpenACC] Implement 'delete' AST/Sema for 'exit data' construct

'delete' is another clause that has very little compile-time
implication, but needs a full AST that takes a var list. This patch
ipmlements it fully, plus adds sufficient test coverage.

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[OpenACC] implement 'detach' clause sema

This is another new clause specific to 'exit data' that takes a pointer
argument. This patch implements this the same way we do a few other
clauses (like att

[OpenACC] implement 'detach' clause sema

This is another new clause specific to 'exit data' that takes a pointer
argument. This patch implements this the same way we do a few other
clauses (like attach) that have the same restrictions.

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[OpenACC] Implement 'if_present' clause sema

The 'if_present' clause controls the replacement of addresses in the
var-list in current device memory. This clause can only go on
'host_device'. From

[OpenACC] Implement 'if_present' clause sema

The 'if_present' clause controls the replacement of addresses in the
var-list in current device memory. This clause can only go on
'host_device'. From a Sema perspective, there isn't anything to do
beyond add this to AST and pass it on.

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[OpenACC] Implement 'finalize' clause sema

This is a very simple clause as far as sema is concerned. It is only
valid on 'exit data', and doesn't have any rules involving it, so it is
simply applie

[OpenACC] Implement 'finalize' clause sema

This is a very simple clause as far as sema is concerned. It is only
valid on 'exit data', and doesn't have any rules involving it, so it is
simply applied and passed onto the MLIR.

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[OpenACC] enable 'attach' clause sema for 'data' and 'enter data'

This is very similar to deviceptr, and is the same implementation as for
combined/compute constructs, so this just enables that, and

[OpenACC] enable 'attach' clause sema for 'data' and 'enter data'

This is very similar to deviceptr, and is the same implementation as for
combined/compute constructs, so this just enables that, and adds tests.

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[OpenACC] Enable 'deviceptr' clause sema on data construct

Another simple implementation, as it uses the same work as the previous
implementation, just enabling it for this construct.

[OpenACC] enable 'present' clause for 'data' construct

No additional sema is required once again, so this patch adds testing
and enables the clause.

[OpenACC] enable 'copyout' clause sema for data constructs

Same as the previous few, this just enables copyout for data constructs
and ensures we have sufficient test coverage.

[OpenACC] enable 'copyin' clause sema for 'data'/'enter data'

stop reporting 'copyin' as not implemented on a data/enter data
construct, and enforce sema rules.

[OpenACC] Implement 'default' Sema for 'data' clause

No additional rules here beyond enabling it, this patch just enables
'default' and adds tests.

[OpenACC] Implement 'wait' sema for data constructs

This is once again simply enabling this for 'data', 'enter data', and
'exit data' (and ensuring we error for 'host_data'). Implementation is
very

[OpenACC] Implement 'wait' sema for data constructs

This is once again simply enabling this for 'data', 'enter data', and
'exit data' (and ensuring we error for 'host_data'). Implementation is
very simply to enable it rather than emit the not-implemented
diagnostic.

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[OpenACC] Implement sema for 'async' on 'data' constructs

This also is a clause that doesn't have any special rules, so this patch
enables it and adds tests.

[OpenACC] Implement 'if' clause sema for 'data' constructs

This is another one that has no additional sema work other than enabling
it, so this patch does just that.

[OpenACC] Implement 'device_type' for 'data' construct

Semantically this is identical to all other constructs with this tag,
except in this case the 'wait' and 'async' are the only ones allowed
afte

[OpenACC] Implement 'device_type' for 'data' construct

Semantically this is identical to all other constructs with this tag,
except in this case the 'wait' and 'async' are the only ones allowed
after it. This patch implements that rule using the existing
infrastructure.

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[OpenACC] Create AST nodes for 'data' constructs

These constructs are all very similar and closely related, so this patch
creates the AST nodes for them, serialization, printing/etc.
Additionally th

[OpenACC] Create AST nodes for 'data' constructs

These constructs are all very similar and closely related, so this patch
creates the AST nodes for them, serialization, printing/etc.
Additionally the restrictions are all added as tests/todos in the tests,
as those will have to be implemented once we get those clauses implemented.

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