[patch]: Make xdata symbol name unique

[Kai Tietz]

Hi,

this patch makes sure that generated .xdata getting more unique names,
so that symbol clash is more unlikely.  I am working on a version,
which uses just temporary symbols and avoid the need of late fixup.
But for now this patch helps to test and bootstrap ongoing work for
x64 SEH for gcc 4.6.

ChangeLog

2010-08-24  Kai Tietz

    * config/obj-coff-seh.c (seh_max_xlbl_name): More
    unique name generation.
    (make_seh_text_label): Likewise.

Tested for x86_64-w64-mingw32. Ok for apply?

Kai

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