[PATCH] R600/SI: Change formatting of printed registers.

[Matt Arsenault]

Print the range of registers used with a single letter prefix. 
This better matches what the shader compiler produces and 
is overall less obnoxious than concatenating all of the 
subregister names together.
    
Instead of SGPR0, it will print s0. Instead of SGPR0_SGPR1, 
it will print s[0:1] and so on.
    
There doesn't appear to be a straightforward way
to get the actual register info in the InstPrinter,
so this parses the generated name to print with the
new syntax.

The required test changes are pretty nasty, and register 
matching regexes are now worse. Since there isn't a way to 
add to a variable in FileCheck, some of the tests now don't 
check the exact number of registers used,  but I don't think that 
will be a real problem.


http://llvm-reviews.chandlerc.com/D2130

Files:
  lib/Target/R600/InstPrinter/AMDGPUInstPrinter.cpp
  lib/Target/R600/InstPrinter/AMDGPUInstPrinter.h
  test/CodeGen/R600/32-bit-local-address-space.ll
  test/CodeGen/R600/64bit-kernel-args.ll
  test/CodeGen/R600/add.ll
  test/CodeGen/R600/address-space.ll
  test/CodeGen/R600/and.ll
  test/CodeGen/R600/bfi_int.ll
  test/CodeGen/R600/build_vector.ll
  test/CodeGen/R600/fabs.ll
  test/CodeGen/R600/fadd64.ll
  test/CodeGen/R600/fcmp64.ll
  test/CodeGen/R600/fconst64.ll
  test/CodeGen/R600/fdiv64.ll
  test/CodeGen/R600/fma.ll
  test/CodeGen/R600/fmul64.ll
  test/CodeGen/R600/fmuladd.ll
  test/CodeGen/R600/fneg.ll
  test/CodeGen/R600/fsqrt.ll
  test/CodeGen/R600/fsub64.ll
  test/CodeGen/R600/imm.ll
  test/CodeGen/R600/indirect-addressing-si.ll
  test/CodeGen/R600/kernel-args.ll
  test/CodeGen/R600/llvm.SI.imageload.ll
  test/CodeGen/R600/llvm.SI.resinfo.ll
  test/CodeGen/R600/llvm.SI.sample-masked.ll
  test/CodeGen/R600/llvm.SI.sample.ll
  test/CodeGen/R600/llvm.SI.sampled.ll
  test/CodeGen/R600/llvm.SI.tbuffer.store.ll
  test/CodeGen/R600/load.ll
  test/CodeGen/R600/load.vec.ll
  test/CodeGen/R600/load64.ll
  test/CodeGen/R600/local-memory-two-objects.ll
  test/CodeGen/R600/local-memory.ll
  test/CodeGen/R600/lshl.ll
  test/CodeGen/R600/lshr.ll
  test/CodeGen/R600/mad_uint24.ll
  test/CodeGen/R600/mul.ll
  test/CodeGen/R600/mul_uint24.ll
  test/CodeGen/R600/mulhu.ll
  test/CodeGen/R600/or.ll
  test/CodeGen/R600/rotr.ll
  test/CodeGen/R600/seto.ll
  test/CodeGen/R600/setuo.ll
  test/CodeGen/R600/sgpr-copy.ll
  test/CodeGen/R600/shl.ll
  test/CodeGen/R600/si-lod-bias.ll
  test/CodeGen/R600/sra.ll
  test/CodeGen/R600/srl.ll
  test/CodeGen/R600/sub.ll
  test/CodeGen/R600/trunc.ll
  test/CodeGen/R600/unaligned-load-store.ll
  test/CodeGen/R600/work-item-intrinsics.ll
  test/CodeGen/R600/xor.ll
  test/CodeGen/R600/zero_extend.ll
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