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

[Greg Roth via cfe-commits]

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@@ -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"))
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pow2clk wrote:

Just an update. As a result of the waning minutes of a design discussion, we resolved to produce a warning when users apply noinline and explicitly set noinline for the outermost entry function which would allow checking for that in place of hlsl.shader here, which might allow graceful resolution of any other functions that happen to get it applied here which we could have an assert for. 

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