[PATCH] Fix for 9807. Avoid over-relaxation of 8-bit immediates in integer arithmetic instructions.

[David Kreitzer]

I decided to go ahead and take care of the FIXME regarding RIP-relative memory references in relaxable arith instructions.  I submitted https://llvm.org/bugs/show_bug.cgi?id=23986 and added a new regression test, relax-arith3.s, that illustrates the current problem and verifies that this new (and ultimately simpler) patch fixes it.

The patch passes "make check-all".


http://reviews.llvm.org/D10766

Files:
  lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
  test/MC/ELF/relax-arith2.s
  test/MC/ELF/relax-arith3.s

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