* configure.in: Check if the assembler supports ".balign" and
        ".p2align" and define HAVE_GAS_BALIGN_AND_P2ALIGN appropriately.
        * acconfig.h (HAVE_GAS_BALIGN_AND_P2ALIGN): New tag.
        * i386/gas.h (ASM_OUTPUT_ALIGN): If the assembler has support for
        ".balign" then use it.

From-SVN: r21023