[PATCH] starting from ARMv8, rGPR includes SP

[Artyom Skrobov]

Hello,

A set of six patches, more or less independent one from another, are
attached for review.

The people who were last to contribute to the code that my patches are
changing are on CC: 

The first patch fixes a long-standing error in the assembler which allowed
SP and PC as shifted-reg operands in ARMv7 Thumb -- despite correctly
rejecting the same registers when not shifted.
A test case which appeared to enshrine this incorrect treatment,
test/MC/ARM/thumb-shift-encoding.s, was committed by Tim back in 2012; my
patch fixes his test, and moves the invalid instructions into
test/MC/ARM/thumb2-diagnostics.s

The second patch adds a case for MCK_rGPR into
ARMAsmParser::validateTargetOperandClass, to allow SP in rGPR, when
assembling for ARMv8 Thumb.
The third patch, similarly, extends DecoderGPRRegisterClass to allow SP in
rGPR, when disassembling ARMv8 Thumb; and changes DecodeSORegImmOperand to
disallow PC (and optionally SP) even when shifted.
The existing implementation of DecodeSORegImmOperand was committed by Owen
in 2011; and of DecoderGPRRegisterClass, by Amaury in 2013.

The next patch includes ARMGenInstrInfo.inc for a second time, after
re-defining rGPRRegClassID, in order to enable the codegen to use the new
encodings that become available in ARMv8 Thumb.
This patch includes a small tweak to InstrInfoEmitter, so that
ARMInstrNameData and ARMInstrNameIndices don't get re-defined.
It also requires to make the getXxxDeprecationInfo predicate functions
non-static.
The code changed by this patch was committed by Tim in 2013.

The last two patches are to revert the special case for BXJ, conditionally
accepting either a GPRnopc or a rGRP operand; and to make
test/MC/ARM/diagnostics.s and test/MC/ARM/thumb2-diagnostics.s more
encompassing, by checking both ARMv7 and ARMv8 handling.
The BXJ patch was committed by Charlie, after review by Renato, just two
month ago.

Any comments on these patches?
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