[clang] [HLSL] add extra scalar vector overloads for clamp (PR #129939)

[Farzon Lotfi via cfe-commits]

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@@ -0,0 +1,7 @@
+// RUN: not %clang_dxc -enable-16bit-types -T cs_6_0 -HV 202x %s 2>&1  | FileCheck %s
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farzonl wrote:

rename to `clang/test/SemaHLSL/BuiltIns/clamp-errors-16bit.hlsl`
```suggestion
// RUN: not %clang_dxc -enable-16bit-types -T cs_6_0 -HV 202x %s 2>&1  | FileCheck %s -DTEST_TYPE= half
// RUN: not %clang_dxc -enable-16bit-types -T cs_6_0 -HV 202x %s 2>&1  | FileCheck %s -DTEST_TYPE= int16_t
// RUN: not %clang_dxc -enable-16bit-types -T cs_6_0 -HV 202x %s 2>&1  | FileCheck %s -DTEST_TYPE= uint16_t
```

https://github.com/llvm/llvm-project/pull/129939