Improved ARM64 disassembly by emitting the right register

Author: TIHan

src/coreclr/jit/emitarm64.cpp

@@ -12063,7 +12063,7 @@ void emitter::emitDispExtendReg(regNumber reg, insOpts opt, ssize_t imm)
     assert(insOptsNone(opt) || insOptsAnyExtend(opt) || (opt == INS_OPTS_LSL));
 
     // size is based on the extend option, not the instr size.
-    emitAttr size = insOpts32BitExtend(opt) ? EA_4BYTE : EA_8BYTE;
+    emitAttr size = insOpts64BitExtend(opt) ? EA_8BYTE : EA_4BYTE;
 
     if (strictArmAsm)
     {

src/coreclr/jit/emitarm64.h

@@ -667,11 +667,6 @@ inline static bool insOptsLSExtend(insOpts opt)
             (opt == INS_OPTS_UXTX) || (opt == INS_OPTS_SXTX));
 }
 
-inline static bool insOpts32BitExtend(insOpts opt)
-{
-    return ((opt == INS_OPTS_UXTW) || (opt == INS_OPTS_SXTW));
-}
-
 inline static bool insOpts64BitExtend(insOpts opt)
 {
     return ((opt == INS_OPTS_UXTX) || (opt == INS_OPTS_SXTX));