This test uses -masm=intel, which isn't supported by Darwin.  Add the
necessary dg-require-effective-target.

gcc/testsuite/ChangeLog:

2019-11-07  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.target/i386/pr92258.c: Add dg-requires for masm_intel.

From-SVN: r277930