[PATCH] Fix TableGen -gen-disassembler output for certain bit field definitions.

[Steve King]

TableGen -gen-disassembler extracts incorrect operand values for certain bit fields with an offset.  The result is that disassembly silently fails with incorrect operand values.  Bit assignments like:
Inst{7-0} = Foo{9-2}
are vulnerable to this problem.

http://reviews.llvm.org/D5498

Files:
  test/TableGen/BitShiftDecoder.td
  utils/TableGen/FixedLenDecoderEmitter.cpp
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