[gold] Merging string literals with bigger alignment

[Cary Coutant]

>> Thanks HJ, your patch cured my powerpc64 problem, but the x86_64 fail
>> remains.
>
> I didn't see this failure on x86-64 with GCC 4.7 nor GCC 4.6.

I tried GCC 4.6 and 4.7 also, and didn't see a failure. Which failure
are you seeing -- the basic_static_test bad_alloc, or the linker
bootstrap test?

-cary