PATCH: Relax AltiVec integral parameter/literal type checking

[Aldy Hernandez]

> I've bootstrapped mainline with a cleaned-up version of Zem's patch
> (whitespace changes to get it to apply) with no regressions.  The new
> test case passes, as do tests 7-01a.c and ira2a.c from gcc.dg/vmx, both
> of which failed to compile without this patch.  There are no other
> changes to the results of tests in gcc.dg/vmx, gcc.dg/altivec* and
> g++.dg/ext/altivec*.
> 
> This patch is needed for the VMX-enabled versions of applications BLAST
> and HMMER to compile.

Janis, thanks so much for following up on this, and testing it.

Yes, this is ok.

-- 
Will hack for surf.