[HLSL][SPIRV]Add SPIRV generation for HLSL dot (#104656)

This adds the SPIRV fdot, sdot, and udot intrinsics and allows them to
be created at codegen depending on the target architecture. This
required moving some of the DXIL-specific choices to DXIL instruction
expansion out of codegen and providing it with at a more generic fdot
intrinsic as well.

Removed some stale comments that gave the obsolete impression that type
conversions should be expected to match overloads.

The SPIRV intrinsic handling involves generating multiply and add
operations for integers and the existing OpDot operation for floating
point.

New tests for generating SPIRV float and integer dot intrinsics are
added as well as expanding HLSL tests to include SPIRV generation

Used new dot product intrinsic generation to implement normalize() in SPIRV

Incidentally changed existing dot intrinsic definitions to use
DefaultAttrsIntrinsic to match the newly added inrinsics

Fixes #88056

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