Fix a bug in the emission of __real/__imag l-values on scalar operands.

Fix a bug in the emission of complex compound assignment l-values.
Introduce a method to emit an expression whose value isn't relevant.
Make that method evaluate its operand as an l-value if it is one.
Fixes our volatile compliance in C++.

llvm-svn: 120931

clang/lib/CodeGen/CGObjC.cpp

@@ -386,8 +386,7 @@ void CodeGenFunction::GenerateObjCSetter(ObjCImplementationDecl *IMP,
                                    FunctionType::ExtInfo()),
              GetCopyStructFn, ReturnValueSlot(), Args);
   } else if (PID->getSetterCXXAssignment()) {
-    EmitAnyExpr(PID->getSetterCXXAssignment(), AggValueSlot::ignored(), true);
-                
+    EmitIgnoredExpr(PID->getSetterCXXAssignment());
   } else {
     // FIXME: Find a clean way to avoid AST node creation.
     SourceLocation Loc = PD->getLocation();