Changes

[MLIR][SPIRV] Add support for GLSL F/U/SClamp.

Adds support for 3 ternary ops from SPIR-V extended instructions for
GLSL. Namely, adds support for FClamp, UClamp, and SClamp.

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D92859

Don't emit on op diagnostic in reproducer emission

This avoids dumping the module post emitting a reproducer, which results in
many MB logs where a reproducer has already been neatly generated.

Differential Revision: https://reviews.llvm.org/D93165

[X86][SSE] combineReductionToHorizontal - add vXi8 ISD::MUL reduction handling (PR39709)

Default expansion leads to repeated extensions/truncations to/from vXi16 which shuffle combining and demanded elts can't completely unravel.

Better just to promote (any_extend) the input and perform a vXi16 reduction.

We'll be able to remove a lot of this if we ever get decent legalization support for reduction intrinsics in SelectionDAG.