testsuite: Move gimplefe-4[0|1] tests.

The gimplefe-40.c and gimplefe-41.c test cases require vect_* effective
targets even though they reside in gcc.dg.  By default e.g.
DEFAULT_VECTCFLAGS which is used to add target-specific machine or build
flags is only applied in the ./vect subdirectory.  Move these tests
there.

gcc/testsuite/ChangeLog:

	* gcc.dg/gimplefe-40.c: Moved to...
	* gcc.dg/vect/gimplefe-40.c: ...here.
	* gcc.dg/gimplefe-41.c: Moved to...
	* gcc.dg/vect/gimplefe-41.c: ...here.