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Reapply "[mlir][SCF] Fold unused `index_switch` results (#173560)"

This reverts commit 85bfb54f9dfcb323f7a8cbb38a264a596aa1a3d3,
i.e. it reapplies #173560 which was temporarily reverted in

added asm test file

[AMDGPU] Take into account amdgpu-waves-per-eu in getRegPressureLimit

The minimum occupancy computed by `getOccupancyWithWorkGroupSizes`
doesn't take into account that the user may have provided a
low-occupancy target through the amdgpu-waves-per-eu attribute.

Bound the minimum-occupancy using the maximum value in
amdgpu-waves-per-eu.

When the user specifies a small amdgpu-waves-per-eu (like "1,1"), this
results in higher vpgr limits.

This patch depends on https://github.com/llvm/llvm-project/pull/168358
to work.

Revert "[mlir][scf] Fold away scf.for iter args cycles (#173436)" (#173991)

It causes issues with Triton usage.

Also revert dependent "[mlir][SCF] index_switch results (#173560)".

Pre-commit test: [AMDGPU] Take into account amdgpu-waves-per-eu in getRegPressureLimit

Revert "[SLP]Exclude non-profitable subtrees."

This reverts commit 79472d366591a39a453c186cf031dda874ddf728 to fix
a bug reported in https://github.com/llvm/llvm-project/pull/162018#pullrequestreview-3617073149

Revert "[aarch64] Mix the frame pointer with the stack cookie when protecting the stack (#161114)" (#173987)

This reverts commit b6bfa856860bb4304e635102872a4c994af101b4.

This commit broke Windows on Arm bots.

Combine scalarized selects back into vector selects

[mlir][IR][NFC] Add `Block::computeBlockNumber` convenience helper (#173475)

Add a helper function to compute the number of a block. Recommended only
for debugging purposes and to print error messages.

[mlir][IR][NFC] Add `Block::computeBlockNumber` helper

[X86] Ensure we fold pow2 masks with the mask type, not the result type (#173984)

This was missed in #173366 when we relaxed the constraint on the types to just be the same element width

Fixes #173794

Revert "Revert 159f1c048e08a8780d92858cfc80e723c90235e3 (#173893)"

This reverts commit 86b9f90b9574b3a7d15d28a91f6316459dcfa046.

tmp commit

simple test working

draft: do not erase IR, just replace uses

fix

tmp commit

simple test working

draft: do not erase IR, just replace uses

[mlir][Analysis] Improve `RegionBranchOpInterface` API usage

[X86] combineArithReduction - avoid PSADBW expansion for 128 bit integers and larger (#173979)

Fixes #173924

[RISCV] Add regalloc hints for BSETI/BEXTI (#173964)

This patch hints the register allocator to use the same source and
destination registers for the `BEXTI/BSETI` instructions when the
`Xqcibm` vendor extension is enabled. This enables the generation of the
compressed `QC_C_BEXTI/QC_C_BSETI` instructions when possible.

[mlir][Interfaces] Add `RegionBranchOpInterface` helper for forwarded values

[mlir][Interfaces] Add `RegionBranchOpInterface` helper for forwarded values

[mlir][Interfaces] Add `RegionBranchOpInterface::getSuccessorOperands` helper (#173971)

Add a helper for querying the successor operands for a region branch
`src -> dst`. Both `src` and `dst` may be the region branch op itself or
a terminator.

This helper allows users to query successor operands for the region
branch op and the terminators in a uniform way. This is similar to
`getSuccessorRegions(RegionBranchPoint)`, which works both for region
branch ops and terminators.

InstCombine: Introduce nsz flag on minimum/maximum in SimplifyDemandedFPClass

Alive isn't particularly happy with this in the case where
one of the inputs could be zero, but I think
it's wrong: https://alive2.llvm.org/ce/z/dF7V6k

nsz shouldn't permit introducing a -0 result where
there wasn't one in the input here.

InstCombine: Handle minimumnum/maximumnum in SimplifyDemandedFPClass

InstCombine: Add baseline minimumnum/maximumnum SimplifyDemandedFPClass tests

InstCombine: Handle minimum/maximum in SimplifyDemandedFPClass

[libc++][ranges] Applied `[[nodiscard]]` to `iota_view` (#173612)

`[[nodiscard]]` should be applied to functions where discarding the
return value is most likely a correctness issue.

- https://libcxx.llvm.org/CodingGuidelines.html
- https://wg21.link/range.iota

Towards #172124

[libc++][ranges] Applied `[[nodiscard]]` to `drop_view` (#173557)

`[[nodiscard]]` should be applied to functions where discarding the
return value is most likely a correctness issue.

- https://libcxx.llvm.org/CodingGuidelines.html
- https://wg21.link/range.drop

Towards #172124

[libc++][NFC] Simplify `gcd` a bit (#173570)

1. With `if constexpr` we can avoid partial specializations of
`__ct_gcd`. This patch changes it to a function template and renames it
to `__abs_in_type` to slightly improve readability.
2. `__gcd` was made non-recursive by
27a062e9ca7c92e89ed4084c3c3affb9fa39aabb, so this patch simply inlines
it into `gcd`.

remove outdated comment

[MLIR] Fix mlir-opt crash in ReshapeOpsUtils.cpp when collapse_shape index is invalid (#173791)

This patch fixes a crash occurring in mlir-opt when running
collapse_shape with an invalid index configuration. Instead of crashing,
an error message is returned to the user.
Fixes: #173567

---------

Co-authored-by: Bazinga! <akparmar004>