[HLSL] Vector Usual Arithmetic Conversions (#110195) HLSL has a different set of usual arithmetic conversions for vector types to resolve a common type for binary operator expressions. This PR implements the current spec proposal from: https://github.com/microsoft/hlsl-specs/pull/311 There is one case that may need additional handling for implicitly truncating vector<T,1> to T early to allow other transformations. Fixes #106253 Re-lands #108659
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