simd3.f90 and simd4.f90 fail only with -msse2. But they are compiled
with -mavx on AVX machines. Add 2 tests to compile simd3.f90 and
simd4.f90 with -msse2 on AVX machines.
PR middle-end/71734
* testsuite/libgomp.fortran/pr71734-1.f90: New test.
* testsuite/libgomp.fortran/pr71734-2.f90: Likewise.
From-SVN: r237950
