[Bug bootstrap/81033] [8 Regression] Revision r249019 breaks bootstrap on darwin

[simon at pushface dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81033

--- Comment #17 from simon at pushface dot org ---
I applied your patches (comment 12, comment 13) to the gcc-8-20170702 snapshot.
Building on darwin 16.6.0 with gcc-7.1.0 as the stage1 compiler was successful
(languages=c,c++,ada).

make check-c:

                === gcc Summary ===

# of expected passes            41267
# of unexpected failures        28
# of expected failures          120
# of unresolved testcases       4
# of unsupported tests          1049