[clang] Fix FnInfoOpts::operator&= and FnInfoOpts::operator|= not updating assigned operands (#107050)

This affects CodeGenTypes::arrangeCall.  No test because the only current in-tree use of that function isn't affected.

Author: mylai-mtk

clang/lib/CodeGen/CGCall.h

@@ -450,12 +450,12 @@ inline FnInfoOpts operator&(FnInfoOpts A, FnInfoOpts B) {
                                  llvm::to_underlying(B));
 }
 
-inline FnInfoOpts operator|=(FnInfoOpts A, FnInfoOpts B) {
+inline FnInfoOpts &operator|=(FnInfoOpts &A, FnInfoOpts B) {
   A = A | B;
   return A;
 }
 
-inline FnInfoOpts operator&=(FnInfoOpts A, FnInfoOpts B) {
+inline FnInfoOpts &operator&=(FnInfoOpts &A, FnInfoOpts B) {
   A = A & B;
   return A;
 }