[i386] Fix push2pop2 test fail on non-linux target [PR112729]

[i386] Fix push2pop2 test fail on non-linux target [PR112729]

On linux x86-64, -fomit-frame-pointer was by default enabled so the
push2pop2 tests cfi scans are based on it. On other target with
-fno-omit-frame-pointer the cfi scan will be wrong as the frame pointer
is pushed at first. Add -fomit-frame-pointer to these tests that related
to cfi scan.

gcc/testsuite/ChangeLog:

	PR target/112729
	* gcc.target/i386/apx-interrupt-1.c: Add -fomit-frame-pointer.
	* gcc.target/i386/apx-push2pop2-1.c: Likewise.
	* gcc.target/i386/apx-push2pop2_force_drap-1.c: Likewise.