x86: Compile PR 125436 tests with -mno-avx

Compile PR 125436 tests with -mno-avx to avoid

FAIL: gcc.target/i386/pr125436-1a.c check-function-bodies ms_tls_access
FAIL: gcc.target/i386/pr125436-1b.c check-function-bodies ms_tls_access
FAIL: gcc.target/i386/pr125436-2a.c check-function-bodies ms_tls_access
FAIL: gcc.target/i386/pr125436-2b.c check-function-bodies ms_tls_access
FAIL: gcc.target/i386/pr125436-3.c check-function-bodies ms_tls_access
FAIL: gcc.target/i386/pr125436-4.c check-function-bodies ms_tls_access

due to the generated instruction

	vmovaps (%rsp), %xmm6

vs the expected instruction

	movaps (%rsp), %xmm6

when AVX is enabled by default.

	PR testsuite/126923
	* gcc.target/i386/pr125436-1a.c (dg-options): Add -mno-avx.
	* gcc.target/i386/pr125436-1b.c (dg-options): Likewise.
	* gcc.target/i386/pr125436-2a.c (dg-options): Likewise.
	* gcc.target/i386/pr125436-2b.c (dg-options): Likewise.
	* gcc.target/i386/pr125436-3.c (dg-options): Likewise.
	* gcc.target/i386/pr125436-4.c (dg-options): Likewise.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>