t-constant fail i686-darwin10

[Torbjorn Granlund]

Please try this patch for the ABI=32 t-constants failure:

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This uses the same type of workaround for a linker/assembler problem as
mpn/x86/pentium4/sse2/popcount.asm.  With luck, it works also for this
file.

-- 
Torbj?rn