[OpenACC] 'wait' clause for compute construct sema

'wait' takes a few int-exprs (well, a series of async-arguments, but
those are effectively just an int-expr), plus a pair of tags. This
patch a

[OpenACC] 'wait' clause for compute construct sema

'wait' takes a few int-exprs (well, a series of async-arguments, but
those are effectively just an int-expr), plus a pair of tags. This
patch adds the support for this to the AST, and does the appropriate
semantic analysis for them.

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[OpenACC] Implement 'async' clause sema for compute constructs

This is a pretty simple clause, it takes an 'async-argument', which
effectively needs to be just parsed as an 'int' argument, since it

[OpenACC] Implement 'async' clause sema for compute constructs

This is a pretty simple clause, it takes an 'async-argument', which
effectively needs to be just parsed as an 'int' argument, since it can
be an arbitrarly integer at runtime (and negative values are legal for
implementation defined values).

This patch also cleans up the async-argument parsing, so 'wait' got some
minor quality-of-life improvements for parsing (both clause and
construct).

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[OpenACC] Implement Sema work for OpenACC Clauses (#87821)

Now that we have AST nodes for OpenACC Clauses, this patch adds their
creation to Sema and makes the Parser call all the required function

[OpenACC] Implement Sema work for OpenACC Clauses (#87821)

Now that we have AST nodes for OpenACC Clauses, this patch adds their
creation to Sema and makes the Parser call all the required functions.
This also redoes TreeTransform to work with the clauses/make sure they
are transformed.

Much of this is NFC, since there is no clause we can test this behavior
with. However, there IS one noticable change; we are now no longer
diagnosing that a clause is 'not implemented' unless it there was no
errors parsing its parameters. This is because it cleans up how we
create and diagnose clauses.

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[OpenACC] Implement beginning parts of the 'parallel' Sema impl (#81659)

This patch Implements AST node creation and appertainment enforcement
for 'parallel', as well as changes the 'not implemente

[OpenACC] Implement beginning parts of the 'parallel' Sema impl (#81659)

This patch Implements AST node creation and appertainment enforcement
for 'parallel', as well as changes the 'not implemented' messages to be
more specific. It does not deal with clauses/clause legality, nor a few
of the other rules from the standard, but this gets us most of the way
for a framework for future construct implementation.

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[OpenACC] Change 'not implemented' diagnostic to be more specific

Currently we just emit a generic 'not implemented' diagnostic for all
OpenACC pragmas. This patch moves the diagnostic to 'Sema' and

[OpenACC] Change 'not implemented' diagnostic to be more specific

Currently we just emit a generic 'not implemented' diagnostic for all
OpenACC pragmas. This patch moves the diagnostic to 'Sema' and diagnoses
for a specific clause or construct, in preperation of implementing Sema
for constructs.

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[OpenACC] Implement 'wait' clause parsing.

The 'wait' clause is parsed the same way as the 'wait' construct, so
this jsut differs to that function.