[clang] [HLSL] Add NativeInt16Type langopt to control whether short type is supported. Enabled by default for all but HLSL. (PR #165584)

[Sarah Spall via cfe-commits]

================
@@ -399,7 +399,7 @@ static void InitializeStandardPredefinedMacros(const 
TargetInfo &TI,
     Builder.defineMacro("__HLSL_202y",
                         Twine((unsigned)LangOptions::HLSLLangStd::HLSL_202y));
 
-    if (LangOpts.NativeHalfType)
+    if (LangOpts.NativeHalfType && LangOpts.NativeInt16Type)
       Builder.defineMacro("__HLSL_ENABLE_16_BIT", "1");
----------------
spall wrote:

and if nativeint16type isn't true the defines will certainly fail because short 
won't be a valid type.

https://github.com/llvm/llvm-project/pull/165584
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