[Bug bootstrap/62077] --with-build-config=bootstrap-lto fails

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62077

--- Comment #32 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, to summarize:

 - Using --param ggc-min-expand=100 --param ggc-min-heapsize=131072 fixes
   LTO bootstrap (I tested x86_64 on the 4.9 branch)

 - Using the patch from comment #26 doesn't fix LTO bootstrap but makes
   build/genconfig.o no longer to miscompare

Thus we seem to have a multitude of GC-related "IL" differences.  Ugh.