Add the optimization in a few other methods

Author: antoyo

src/builder.rs

@@ -843,15 +843,16 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
     }
 
     fn and(&mut self, a: RValue<'gcc>, b: RValue<'gcc>) -> RValue<'gcc> {
-        self.gcc_and(a, b)
+        self.assign_to_var(self.gcc_and(a, b))
     }
 
     fn or(&mut self, a: RValue<'gcc>, b: RValue<'gcc>) -> RValue<'gcc> {
-        self.cx.gcc_or(a, b, self.location)
+        self.assign_to_var(self.cx.gcc_or(a, b, self.location))
     }
 
     fn xor(&mut self, a: RValue<'gcc>, b: RValue<'gcc>) -> RValue<'gcc> {
-        set_rvalue_location(self, self.gcc_xor(a, b))
+        let result = set_rvalue_location(self, self.gcc_xor(a, b));
+        self.assign_to_var(result)
     }
 
     fn neg(&mut self, a: RValue<'gcc>) -> RValue<'gcc> {