[PATCH] move gcov-dump functionality to gcov-tool

[Rong Xu]

Hi

This patch moves the gcov-dump functionality to gcov-tool (which is
installed by default).
The options are exactly the same as before. The difference is instead of calling
"gcov-dump ...", we now call "gcov-tool dump ..."

gcov-dump is useful in debugging fdo issues. I think it would be very
helpful to make it available with the compiler.

gcov-dump.c and the build construct are deleted with this patch.

Tested with bootstrap and some spec2006 profiles.

Thanks,

-Rong