[PATCH 0/4] ASAN for MIPS (o32)

[Hans-Peter Nilsson <hans-peter dot nilsson at axis dot com>]

All patches are together run through the gcc and g++ test-suites
to check ASAN results for mipsisa32r2el-linux-gnu.  As of
r258635 those results are on par with those for
arm-linux-gnueabihf, so without delay I present the current
state.  Maybe it's non-intrusive enough to be ok for gcc-8?
MIPS maintainers (and interested party) CC:ed.

For use with -fsanitize=address, you'll need a non-ancient glibc
or equivalent (2002-ish), one that iterates on ELF headers for
the EH info at exception time (rather, doesn't call
__register_frame_info or __register_frame_info_bases at startup,
ending up calling malloc/free) or else Asan will try to
instrument the call to free and hang on a lock for eternity (or
dies on a signal).  But that's no different than for other
ports, AFAIU.

So, ok to commit?

brgds, H-P