[vta/trunk?] bootstrap-compare everything, not just gcc

[Alexandre Oliva]

This patch arranges for the compare that follows a bootstrapped build
of gcc and libgcc to compare not only the gcc directory, but also all
other staged directories.

This is useful to detect codegen differences in subdirectories other
than gcc, including in target libraries.  With make bootstrap, it will
only compare libgcc, but following bootstrap by bootstrap4, and then
re-running compare3 after bootstrap4 rebuilds target libraries (it
will normally run after building libgcc), all target libraries are
compared.

Is it too late to make this kind of change for 4.3?

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