[PATCH] Fix decoding of ARM mov/movt/movw writing sp operand

[Mihail Popa]

Hello.

Please review this simple instruction decoding fix. The MC disassembler 
does not decode correctly mov instructions which place an immediate into 
sp. Assembly works fine:

echo "movt sp, #0xd45" | ../build/bin/llvm-mc -assemble -show-inst 
-triple=armv7 -show-encoding
.text
movt sp, #3397 @ encoding:[0x45,0xdd,0x40,0xe3]
@ <MCInst #232 MOVTi16
@ <MCOperand Reg:105>
@ <MCOperand Reg:105>
@ <MCOperand Imm:3397>
@ <MCOperand Imm:14>
@ <MCOperand Reg:0>>

but disassembly fails:

echo "0x45 0xdd 0x40 0xe3" | ../build/bin/llvm-mc -disassemble 
-show-inst -triple=armv7 -show-encoding
.text
<stdin>:1:1: warning: invalid instruction encoding
0x45 0xdd 0x40 0xe3
^
<stdin>:1:6: warning: invalid instruction encoding
0x45 0xdd 0x40 0xe3
^
<stdin>:1:11: warning: invalid instruction encoding
0x45 0xdd 0x40 0xe3
^
<stdin>:1:16: warning: invalid instruction encoding
0x45 0xdd 0x40 0xe3

Regards,
Mihai
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