[HLSL] Clean up CodeGenHLSL/*-overload.hlsl tests

[bogner]

See #137898 - it's likely that the other similar tests have the same problem.

This is the full list as of 5/7/2025 but it should be rechecked before closing the issue:

• clang/test/CodeGenHLSL/builtins/radians-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/lerp-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/max-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/atan2-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/cos-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/min-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/ceil-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/log10-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/sin-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/round-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/atan-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/sqrt-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/exp-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/cosh-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/sinh-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/exp2-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/trunc-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/normalize-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/pow-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/frac-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/tanh-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/degrees-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/log-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/asin-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/acos-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/step-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/isinf-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/rsqrt-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/tan-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/floor-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/clamp-overloads.hlsl
• clang/test/CodeGenHLSL/builtins/log2-overloads.hlsl

[V-FEXrt]

I'm working on clamp, max, min, and pow from this list as a dependency of another change I'm working on