[PATCH] X86: lower MO_GOT_ABSOLUTE_ADDRESS in LowerSymbolOperand like all the other MO_ types.

[Larry D'Anna]

I tested this by self-compiling a i686 llvm and running the regression tests:

   * applied patch

   * compiled llvm+clang with native compiler

   * used the llvm I just built to build a i686-linux-gnu llvm 

   * ran the tests on that

I also scanned the resulting object files for the optimization that was disabled
by the FIXMEs that I removed.  It should look like a add32ri instruction with a
GOTPC reloc on the immediate operand, which has been folded into a add32mi
instruction.  This did occur in ARMDisassembler.cpp.

Sorry for the mis-formatted attempt at submitting the patch.