[clang][bytecode][NFC] Fix CallBI function signature

This doesn't modify the PC, so pass OpPC as a copy.

Author: tbaederr

clang/lib/AST/ByteCode/Interp.cpp

@@ -1177,16 +1177,16 @@ bool CallVirt(InterpState &S, CodePtr OpPC, const Function *Func,
   return true;
 }
 
-bool CallBI(InterpState &S, CodePtr &PC, const Function *Func,
+bool CallBI(InterpState &S, CodePtr OpPC, const Function *Func,
             const CallExpr *CE, uint32_t BuiltinID) {
   if (S.checkingPotentialConstantExpression())
     return false;
-  auto NewFrame = std::make_unique<InterpFrame>(S, Func, PC);
+  auto NewFrame = std::make_unique<InterpFrame>(S, Func, OpPC);
 
   InterpFrame *FrameBefore = S.Current;
   S.Current = NewFrame.get();
 
-  if (InterpretBuiltin(S, PC, Func, CE, BuiltinID)) {
+  if (InterpretBuiltin(S, OpPC, Func, CE, BuiltinID)) {
     NewFrame.release();
     return true;
   }

clang/lib/AST/ByteCode/Interp.h

@@ -154,7 +154,7 @@ bool Call(InterpState &S, CodePtr OpPC, const Function *Func,
           uint32_t VarArgSize);
 bool CallVirt(InterpState &S, CodePtr OpPC, const Function *Func,
               uint32_t VarArgSize);
-bool CallBI(InterpState &S, CodePtr &PC, const Function *Func,
+bool CallBI(InterpState &S, CodePtr OpPC, const Function *Func,
             const CallExpr *CE, uint32_t BuiltinID);
 bool CallPtr(InterpState &S, CodePtr OpPC, uint32_t ArgSize,
              const CallExpr *CE);