[Bug target/49146] segv from libgcc_s when raising an exception, or unwinding stack with backtrace with ms_abi

[woodard at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49146

--- Comment #5 from Ben Woodard <woodard at redhat dot com> ---
Ariel,

In talking to the engineers regarding this, they would like _builtin_expect
hints to tell the compiler to generate code saying that hitting this is
unlikely. 

http://blog.man7.org/2012/10/how-much-do-builtinexpect-likely-and.html