[AArch64] Remove unused includes (NFC) (#115685)

Identified with misc-include-cleaner.

[NFC] Rename `Intrinsic::getDeclaration` to `getOrInsertDeclaration` (#111752)

Rename the function to reflect its correct behavior and to be consistent
with `Module::getOrInsertFunction`. This is a

[NFC] Rename `Intrinsic::getDeclaration` to `getOrInsertDeclaration` (#111752)

Rename the function to reflect its correct behavior and to be consistent
with `Module::getOrInsertFunction`. This is also in preparation of
adding a new `Intrinsic::getDeclaration` that will have behavior similar
to `Module::getFunction` (i.e, just lookup, no creation).

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[IRBuilder] Don't include Module.h (NFC) (#97159)

This used to be necessary to fetch the DataLayout, but isn't anymore.

[AArch64] Replace LLVM IR function attributes for PSTATE.ZA. (#79166)

Since https://github.com/ARM-software/acle/pull/276 the ACLE
defines attributes to better describe the use of a given SME state

[AArch64] Replace LLVM IR function attributes for PSTATE.ZA. (#79166)

Since https://github.com/ARM-software/acle/pull/276 the ACLE
defines attributes to better describe the use of a given SME state.

Previously the attributes merely described the possibility of it being
'shared' or 'preserved', whereas the new attributes have more semantics
and also describe how the data flows through the program.

For ZT0 we already had to add new LLVM IR attributes:
* aarch64_new_zt0
* aarch64_in_zt0
* aarch64_out_zt0
* aarch64_inout_zt0
* aarch64_preserves_zt0

We have now done the same for ZA, such that we add:
* aarch64_new_za (previously `aarch64_pstate_za_new`)
* aarch64_in_za (more specific variation of `aarch64_pstate_za_shared`)
* aarch64_out_za (more specific variation of `aarch64_pstate_za_shared`)
* aarch64_inout_za (more specific variation of
`aarch64_pstate_za_shared`)
* aarch64_preserves_za (previously `aarch64_pstate_za_shared,
aarch64_pstate_za_preserved`)

This explicitly removes 'pstate' from the name, because with SME2 and
the new ACLE attributes there is a difference between "sharing ZA"
(sharing
the ZA matrix register with the caller) and "sharing PSTATE.ZA" (sharing
either the ZA or ZT0 register, both part of PSTATE.ZA with the caller).

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[AArch64][SME2] Extend SMEABIPass to handle functions with new ZT0 state (#78848)

updateNewZAFunctions is extended to generate the following on entry to a
function with either the "aarch64_pstate_z

[AArch64][SME2] Extend SMEABIPass to handle functions with new ZT0 state (#78848)

updateNewZAFunctions is extended to generate the following on entry to a
function with either the "aarch64_pstate_za_new" or "arm_new_zt0"
attribute:
- Private-ZA interface: commit any active lazy-saves & enable PSTATE.ZA.
- "aarch64_pstate_za_new": zero ZA.
- "arm_new_zt0": zero ZT0.

Additionally, PSTATE.ZA should disabled before returning if the function
has a private-ZA interface.

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[Target] Remove unnecessary includes (NFC)

[AArch64][SME] Emit Zero instruction for NewZA functions

[The ACLE](https://github.com/ARM-software/acle/pull/268) Demands that
functions with the aarch64_pstate_za_new attribute set all bits of th

[AArch64][SME] Emit Zero instruction for NewZA functions

[The ACLE](https://github.com/ARM-software/acle/pull/268) Demands that
functions with the aarch64_pstate_za_new attribute set all bits of the
ZA register to zero upon entry.

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[AArch64][SME] NFC: Rename hasNewZAInterface to hasNewZABody.

__arm_new_za is a declaration attribution, not a type attribute,
and is therefore not part of the interface of a function.

[NFC] Cleanup: Remove Function::getBasicBlockList() when not required.

This is part of a series of patches that aim at making Function::getBasicBlockList() private.

Differential Revision: https://r

[NFC] Cleanup: Remove Function::getBasicBlockList() when not required.

This is part of a series of patches that aim at making Function::getBasicBlockList() private.

Differential Revision: https://reviews.llvm.org/D139910

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Reland "[AArch64][SME] Disable GlobalISel/FastISel for SME functions."

It turns that the issue was unrelated to the code-changes, but only triggered
by one of the tests. The SMEABI pass incorrectly

Reland "[AArch64][SME] Disable GlobalISel/FastISel for SME functions."

It turns that the issue was unrelated to the code-changes, but only triggered
by one of the tests. The SMEABI pass incorrectly marked the CFG as preserved,
even though it modified the CFG.

This reverts commit 8bcf5df3043a906c7124b70b59eda925eddd7319.

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[AArch64][SME] Set fn attributes correctly on __arm_tpidr2_save call.

Changing the way the attribute is created changes the way the attribute
is added. Now it seems to be correctly added as a functi

[AArch64][SME] Set fn attributes correctly on __arm_tpidr2_save call.

Changing the way the attribute is created changes the way the attribute
is added. Now it seems to be correctly added as a function attribute, whereas
before it was not. This led ISel ignoring attributes and setting up a lazy-save
buffer for the call to __arm_tpidr2_save.

This patch also marks the intrinsic call as 'preserves_za' which together with the
above prevents the code-generator from setting up a lazy-save buffer.

Reviewed By: kmclaughlin

Differential Revision: https://reviews.llvm.org/D136342

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[AArch64][SME] Add codegen pass to handle ZA state in arm_new_za functions.

The new pass implements the following:

* Inserts code at the start of an arm_new_za function to
commit a lazy-save wh

[AArch64][SME] Add codegen pass to handle ZA state in arm_new_za functions.

The new pass implements the following:

* Inserts code at the start of an arm_new_za function to
commit a lazy-save when the lazy-save mechanism is active.
* Adds a smstart intrinsic at the start of the function.
* Adds a smstop intrinsic at the end of the function.

Patch co-authored by kmclaughlin.

Differential Revision: https://reviews.llvm.org/D133896

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