[PATCH][aarch64] fix inline asm clobber list in tls-macros.h

[Szabolcs Nagy]

AArch64 TLS_GD macro calls __tlsget_addr from inline asm, because
the exact TLS instruction sequence matters, but cc was not on the
clobber list so elf/tst-tlsmod2.so was miscompiled and thus
elf/tst-tls4 and elf/tst-tls-dlinfo tests failed.

It seems tls-macros.h is only used in tests.
Is this patch ok?

Changelog:

2015-03-05  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/aarch64/tls-macros.h (TLS_GD): Add "cc" to the clobber list.
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