[Codacy] Fixed some issues found by codacy.

Added skipping shaders directory in scan

src/xenia/cpu/backend/x64/x64_backend.cc

@@ -1172,7 +1172,7 @@ void* X64HelperEmitter::EmitVectorVRsqrteHelper(void* scalar_helper) {
   vshufps(xmm0, xmm0,xmm0, _MM_SHUFFLE(3, 3, 3, 3));
   call(scalar_helper);
   // this->DebugBreak();
-  vinsertps(xmm0, xmm0, (3 << 4) | (0 << 6));
+  vinsertps(xmm0, xmm0, (3 << 4));
 
   vblendps(xmm0, xmm0, ptr[backend()->LookupXMMConstantAddress(XMMFloatInf)],
            0b0111);

src/xenia/cpu/hir/value.cc

@@ -1593,7 +1593,6 @@ void Value::VectorAverage(Value* other, TypeName type, bool is_unsigned,
 void Value::ByteSwap() {
   switch (type) {
     case INT8_TYPE:
-      constant.i8 = constant.i8;
       break;
     case INT16_TYPE:
       constant.i16 = xe::byte_swap(constant.i16);