[clang] [CIR] Add math and builtin intrinsics support (PR #175233)

[via cfe-commits]

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@@ -2196,7 +2197,44 @@ void CIRGenModule::setCIRFunctionAttributesForDefinition(
   } else if (codeGenOpts.getInlining() == CodeGenOptions::OnlyAlwaysInlining) {
     // If inlining is disabled, force everything that isn't always_inline
     // to carry an explicit noinline attribute.
+    // However, don't mark functions as noinline if they only contain
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adams381 wrote:

This change aligns the `isConstant` calculation with classic codegen's `EmitGlobalVarDefinition`. The original code set the constant flag after the global was created, which caused inconsistencies. By calculating `isConstant` before `createGlobalOp` and using `ExcludeCtor=true` (constructors run at init time, not storage time) and `ExcludeDtor=!needsDtor` (only consider destructor if needed), we match OGCG behavior.

https://github.com/llvm/llvm-project/pull/175233