This adds MC support for fused compare + indirect branch instructions,
ie. CRB, CGRB, CLRB, CLGRB, CIB, CGIB, CLIB, CLGIB. They aren't actually
generated yet -- this is preparation for their use for conditional
returns in the next iteration of D17339.
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Please also add disassembler tests for the new instructions to test/MC/Disassembler/SystemZ/insns.txt
Otherwise this looks good to me.
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I've checked this in for you now. Longer term, if you plan on making more contributions to LLVM, you might want to get SVN access yourself, as outlined here: http://llvm.org/docs/DeveloperPolicy.html#obtaining-commit-access