[tuples] Fix libstdc++ builds

["Diego Novillo" <dnovillo at google dot com>]

This patch fixes the last libstdc++ build problem.  This was
another memory corruption error.  We were storing gimple bodies
in a pointer map, which are not in GC memory.  This caused PCH to
never restore gimple bodies.

The patch changes gimple_body and gimple_set_body to store the
gimple sequence for the function's body inside the
DECL_STRUCT_FUNCTION object associated to the decl.

This patch also incorporates a patch from Oleg to fix handling of
GIMPLE_CONDs in EH lowering.

The only remaining failure now is in libjava.  This patch fixes
around 1,600 regressions in the testsuites.

I've also realized that we have a bootstrap failure in 64 bit
hosts, but it's not related to this patch.  I will look at that
next.

Bootstrapped and tested on x86.


Diego.

Attachment: 20080501-fix-pch.diff.txt
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