testsuite: i386: Fix gcc.target/i386/pr38534-1.c etc. on Solaris/x86

The gcc.target/i386/pr38534-1.c etc. tests FAIL on 32 and 64-bit
Solaris/x86:

FAIL: gcc.target/i386/pr38534-1.c scan-assembler-not push
FAIL: gcc.target/i386/pr38534-2.c scan-assembler-not push
FAIL: gcc.target/i386/pr38534-3.c scan-assembler-not push
FAIL: gcc.target/i386/pr38534-4.c scan-assembler-not push

The tests assume the Linux/x86 default of -fomit-frame-pointer, while
Solaris/x86 defaults to -fno-omit-frame-pointer.

Fixed by specifying -fomit-frame-pointer explicitly.

Tested on i386-pc-solaris2.11 and i686-pc-linux-gnu.

2024-01-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc/testsuite:
	* gcc.target/i386/pr38534-1.c: Add -fomit-frame-pointer to
	dg-options.
	* gcc.target/i386/pr38534-2.c: Likewise.
	* gcc.target/i386/pr38534-3.c: Likewise.
	* gcc.target/i386/pr38534-4.c: Likewise.