[SPIR-V] Re-enable -verify-machineinstrs on tests (#114388)

Many tests had this flag removed because of the G_BITCAST emission
issue. Now that the PR is merged, we can re-enable this additional
ch

[SPIR-V] Re-enable -verify-machineinstrs on tests (#114388)

Many tests had this flag removed because of the G_BITCAST emission
issue. Now that the PR is merged, we can re-enable this additional
check.

2 tests (basic_int_types) just have the TODO removed because they are
not useful for SPIR-V as-is: SPIR-V requires reg2mem/mem2reg to run,
which removes all the body. Integers are used in other spirv tests, and
seems like testing for spirv32/64 and relying on others for the logical
target coverage should be fine.

Signed-off-by: Nathan Gauër <brioche@google.com>

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[SPIR-V] Fix BB ordering & register lifetime (#111026)

The "topological" sorting was behaving incorrectly in some cases:
the exit of a loop could have a lower rank than a node in the loop.
This c

[SPIR-V] Fix BB ordering & register lifetime (#111026)

The "topological" sorting was behaving incorrectly in some cases:
the exit of a loop could have a lower rank than a node in the loop.
This causes issues when structurizing some patterns, and also codegen
issues as we could generate BBs in the incorrect order in regard to the
SPIR-V spec.

Fixing this ordering alone broke other parts of the structurizer, which
by luck worked. Had to fix those.

Added more test cases, especially to test basic patterns.

I also needed to tweak/disable some tests for 2 reasons:
- SPIR-V now required reg2mem/mem2reg to run. Meaning dead stores
are optimized away. Some tests require tweaks to avoid having the
whole function removed.
- Mem2Reg will generate variable & load/stores. This generates
G_BITCAST in several cases. And there is currently something wrong
we do with G_BITCAST which causes MIR verifier to complain.
Until this is resolved, I disabled -verify-machineinstrs flag on
those tests.

---------

Signed-off-by: Nathan Gauër <brioche@google.com>

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Reapply "[SPIRV] Add radians intrinsic"

I had too many tabs open and reverted #110800 by mistake, it was
supposed to be #110616.

This reverts commit dec6fe3de0f6475ea83391e5b0b4036cf56db35b.

[SPIRV] Add radians intrinsic (#110800)

partially fixes #99151

### Changes
* Added int_spv_radians intrinsic in IntrinsicsSPIRV.td
* Added lowering for int_spv_radians in SPIRVInstructionSelect

[SPIRV] Add radians intrinsic (#110800)

partially fixes #99151

### Changes
* Added int_spv_radians intrinsic in IntrinsicsSPIRV.td
* Added lowering for int_spv_radians in SPIRVInstructionSelector.cpp
* Added DXIL backend test case

### Related PRs
* [[clang][HLSL] Add radians intrinsic
#110802](https://github.com/llvm/llvm-project/pull/110802)
* [[DXIL] Add radians intrinsic
#110616](https://github.com/llvm/llvm-project/pull/110616)

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