[Bug target/81763] Issues with 32bit x86 apps on GCC 7.1+

["mike at fireburn dot co.uk" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81763

--- Comment #2 from Mike Lothian <mike at fireburn dot co.uk> ---
Sorry I should have been more clear, this is LLVM trunk

I'm using these flags: 

CFLAGS="-O2 -march=native -pipe"
CXXFLAGS="-O2 -march=native -pipe"
LDFLAGS="-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed"

gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/7.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-7.1.0-r1/work/gcc-7.1.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/7.1.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.1.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.1.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.1.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.1.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.1.0/include/g++-v7
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/7.1.0/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 7.1.0-r1 p1.1' --disable-esp --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
--enable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto --with-isl
--disable-isl-version-check --enable-libsanitizer --disable-default-pie
--disable-default-ssp
Thread model: posix
gcc version 7.1.0 (Gentoo 7.1.0-r1 p1.1)