[PATCH] __atomic library calls which are external may require some label exporting

[Andrew MacLeod]

On any target which defines ASM_OUTPUT_EXTERNAL, there is some fiddling 
that has to be done with external labels. hpux is such a target, and any 
unresolved functions need to be emitted as CODE labels rather than the 
default DATA label.

previously, all __builtin functions were considered to be incorporeal 
and didnt need any processing, but this is not true for __atomic or even 
any __sync which may get to the point of being an external call.

Dave has already tested this patch against PR 51011 which he opened.  I 
believe it did the trick?

bootstraps with no new regressions on x86_64-unknown-linux-gnu... as it 
should since most of this only makes it into the compiler if 
ASM_OUTPUT_EXTERNAL is actually defined.

Andrew

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