RFC: TLS improvements for IA32 and AMD64/EM64T

[Alexandre Oliva]

Over the past few months, I've been working on porting to IA32 and
AMD64/EM64T the interesting bits of the TLS design I came up with for
FR-V, achieving some impressive speedups along with slight code size
reductions in the most common cases.

Although the design is not set in stone yet, it's fully implemented
and functional with patches I'm about to post for binutils, gcc and
glibc mainline, as follow-ups to this message, except that the GCC
patch will go to gcc-patches, as expected.

The specs RFC is attached.  Comments are welcome.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}