openmp: Avoid floating point comparison at the end of bb with -fnon-call-exceptions

openmp: Avoid floating point comparison at the end of bb with -fnon-call-exceptions

The following testcase ICEs with -fexceptions -fnon-call-exceptions because
in that mode floating point comparisons should not be done at the end of bb
in GIMPLE_COND.  Fixed by forcing it into a bool SSA_NAME and comparing that against
false.

2020-08-08  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/96424
	* omp-expand.c: Include tree-eh.h.
	(expand_omp_for_init_vars): Handle -fexceptions -fnon-call-exceptions
	by forcing floating point comparison into a bool temporary.

	* c-c++-common/gomp/pr96424.c: New test.