[vta,trunk?] inlining gen_rtvec_v into gen_rtvec warns

[Alexandre Oliva]

Bootstrapping with -O3 on x86/64? causes gen_rtvec_v() to be inlined
into gen_rtvec().  This in turns causes the test for n == 0, already
performed in the caller, to be warned about, since it's always false.
I don't think it is appropriate to warn in this case, but this patches
permits bootstrap with -O3 to succeed.

I'm installing it on the branch.  Should I install it on the trunk as
well?

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}
FSFLA Board Member       ?S? Libre! => http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}