[Clang] Update typechecking of builtin elementwise ternary math operators (#155620) For scalars we directly compare their unqualified types. But even if we compare unqualified vector types, a difference in qualifiers in the element types can make the vector types be considered not equal. For example, vector of 4 'const float' values vs vector of 4 'float' values. So we compare unqualified types of their elements and number of elements. Fixes #155405
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