[asan] Support handle_sigfpe on Darwin

[kcc]

test?

[kubamracek]

Sounds like the TestCases/Linux/fpe.cc could be just moved one directory up.

[kcc]

In D29355#662364, @kubamracek wrote:

Sounds like the TestCases/Linux/fpe.cc could be just moved one directory up.

Almost.
Don't forget there are platforms other than Linux and OSX.
So we'll also need a REQUIRES lines or something.

[kubamracek]

Right. I meant the Posix/ subdirectory, assuming this is okay on FreeBSD (which it should be, because sanitizer_linux.cc is also used on BSD).

[bogner]

Move fpe test from Linux to Posix

[kcc]

LGTM
please watch the bots (there are other Posix OSes out there).

[bogner]

r293746

lib/sanitizer_common/sanitizer_mac.cc

     return true;
   if (common_flags()->handle_sigill && signum == SIGILL)
     return true;
+  if (common_flags()->handle_sigfpe && signum == SIGFPE)
+    return true;
   return (signum == SIGSEGV || signum == SIGBUS) && common_flags()->handle_segv;
 }