AMDGPU: Remove excessive padding from ImmOp and RegOp.

The structs ImmOp and RegOp are in AArch64AsmParser.cpp (inside
anonymous namespace).
This diff changes the order of fields and removes the excessive padding
(8 bytes).

Patch by Alexander Shaposhnikov

llvm-svn: 278844

llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp

@@ -136,18 +136,18 @@ public:
   };
 
   struct ImmOp {
-    bool IsFPImm;
-    ImmTy Type;
     int64_t Val;
+    ImmTy Type;
+    bool IsFPImm;
     Modifiers Mods;
   };
 
   struct RegOp {
-    unsigned RegNo;
-    Modifiers Mods;
     const MCRegisterInfo *TRI;
     const MCSubtargetInfo *STI;
+    unsigned RegNo;
     bool IsForcedVOP3;
+    Modifiers Mods;
   };
 
   union {