Update BIG5-HKSCS charmap to HKSCS-2008
PowerPC: Merge ports/ dl-procinfo.[ch] with base.
PowerPC: Remove redundant ports/sysdeps/powerpc/dl-procinfo.[ch].
Port remaining string benchmarks

There were a few more string benchmarks (strcpy_chk and stpcpy_check)
in the debug directory that needed to be ported over.
Add exception information to math-tests.h and use it in libm-test.inc.