Introduce TRY_STATIC_TLS macro, used in FR-V

[Alexandre Oliva]

This patch introduces TRY_STATIC_TLS, a macro that can be used to test
whether a module's TLS block is in the static TLS block, or can be
assigned there.

If you use a sufficiently-recent version of GCC and never call
TRY_STATIC_TLS, the new static intermediate function will be fully
inlined into the single caller, without any performance hit
whatsoever.

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