[clang][bytecode] Save Immediate bit in Function

Otherwise, we have to look at the FunctionDecl at every function call.

Author: tbaederr

clang/lib/AST/ByteCode/Function.cpp

@@ -26,6 +26,7 @@ Function::Function(Program &P, FunctionDeclTy Source, unsigned ArgSize,
       HasRVO(HasRVO) {
   if (const auto *F = dyn_cast<const FunctionDecl *>(Source)) {
     Variadic = F->isVariadic();
+    Immediate = F->isImmediateFunction();
     if (const auto *CD = dyn_cast<CXXConstructorDecl>(F)) {
       Virtual = CD->isVirtual();
       Kind = FunctionKind::Ctor;

clang/lib/AST/ByteCode/Function.h

@@ -155,6 +155,7 @@ class Function final {
 
   /// Checks if the function is virtual.
   bool isVirtual() const { return Virtual; };
+  bool isImmediate() const { return Immediate; }
 
   /// Checks if the function is a constructor.
   bool isConstructor() const { return Kind == FunctionKind::Ctor; }
@@ -292,6 +293,7 @@ class Function final {
   bool Defined = false;
   bool Variadic = false;
   bool Virtual = false;
+  bool Immediate = false;
 
 public:
   /// Dumps the disassembled bytecode to \c llvm::errs().

clang/lib/AST/ByteCode/Interp.cpp

@@ -1502,7 +1502,7 @@ bool Call(InterpState &S, CodePtr OpPC, const Function *Func,
   InterpFrame *FrameBefore = S.Current;
   S.Current = NewFrame.get();
 
-  InterpStateCCOverride CCOverride(S, Func->getDecl()->isImmediateFunction());
+  InterpStateCCOverride CCOverride(S, Func->isImmediate());
   // Note that we cannot assert(CallResult.hasValue()) here since
   // Ret() above only sets the APValue if the curent frame doesn't
   // have a caller set.