Get the align info for COMMON symbols.

BUG=5057160.
Tested on x86, crespo and stingray.

Change-Id: I4a28604a8412d08f2636e2e470793887973666c7
TODO: I did a workaround for .lcomm directives bug of LLVM ARM MC code
      generator.  Remove this when the LLVM bug is fixed.
TODO: Need to refactor initSHNCommonDataSize.
2 files changed