x86: Update PR 35513 tests

1. Require linker with GNU_PROPERTY_1_NEEDED support for PR 35513
run-time tests.
2. Compile pr35513-8.c to scan assembly code.

	PR testsuite/104481
	* g++.target/i386/pr35513-1.C: Require property_1_needed target.
	* g++.target/i386/pr35513-2.C: Likewise.
	* gcc.target/i386/pr35513-8.c: Change to compile.
	* lib/target-supports.exp (check_compile): Support assembly code.
	(check_effective_target_property_1_needed): New proc.