[clang] [HLSL] set alwaysinline on HLSL functions (PR #106588)

[Chris B via cfe-commits]

================
@@ -2471,11 +2471,14 @@ void 
CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
     B.addAttribute(llvm::Attribute::StackProtectReq);
 
   if (!D) {
+    // HLSL functions must always be inlined
+    if (getLangOpts().HLSL && !F->hasFnAttribute("hlsl.shader"))
----------------
llvm-beanz wrote:

What if we put `noinline` on the entry function? Does that simplify this logic? 
Since we'll also at some point need to support the `noinline` keyword we'll 
need to be checking that attribute somewhere.

https://github.com/llvm/llvm-project/pull/106588
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