[PATCH] Fix ARMFastISel::ARMEmitIntExt shift emission

[JF Bastien]

My patch "r183551 - ARM FastISel integer sext/zext improvements" was
incorrect when emitting ARM register-immediate ASR, LSL, LSR
instructions: they are pseudo-instructions in ARMInstrInfo.td and I
should have used MOVsi instead.

This is not an issue when code is generated through a .s file, but is
an issue when generated straight to a .o (-filetype=obj).

The attached patch fixes this issue by using MOVsi instead of
ASRi/LSLi/LSRi. It reorganizes the lookup table so that sext/zext
cases are consecutive table entries instead of sharing a struct entry
(other non-ARM-shift entries are unchanged, simply moved).
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