Add more tests for PR ld/19539

	PR ld/19539
	* testsuite/ld-i386/i386.exp: Run pr19539.
	* testsuite/ld-i386/pr19539.d: New file.
	* testsuite/ld-i386/pr19539.s: Likewise.
	* testsuite/ld-i386/pr19539.t: Likewise.
	* testsuite/ld-x86-64/pr19539.s: Likewise.
	* testsuite/ld-x86-64/pr19539.t: Likewise.
	* testsuite/ld-x86-64/pr19539a.d: Likewise.
	* testsuite/ld-x86-64/pr19539b.d: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Run pr19539a and pr19539b.