[Inlining] Add a clang option to limit inlining of functions

Add the clang option -finline-max-stacksize=<N> to suppress inlining
of functions whose stack size exceeds the given value.

Reviewed By: aeubanks

Differential Revision: https://reviews.llvm.org/D131986

clang/lib/CodeGen/CodeGenModule.cpp

@@ -2372,6 +2372,9 @@ void CodeGenModule::SetFunctionAttributes(GlobalDecl GD, llvm::Function *F,
   if (getLangOpts().OpenMP && FD->hasAttr<OMPDeclareSimdDeclAttr>())
     getOpenMPRuntime().emitDeclareSimdFunction(FD, F);
 
+  if (CodeGenOpts.InlineMaxStackSize != UINT_MAX)
+    F->addFnAttr("inline-max-stacksize", llvm::utostr(CodeGenOpts.InlineMaxStackSize));
+
   if (const auto *CB = FD->getAttr<CallbackAttr>()) {
     // Annotate the callback behavior as metadata:
     //  - The callback callee (as argument number).