ld: Find and run some tests using a wildcard pattern

ld: Find and run some tests using a wildcard pattern

Find the ld-script/provide-*.d tests using a wildcard, then run them in
a loop.  This will make it easier to add more tests in the future.  Some
associated clean up is required.

ld/ChangeLog:

	* testsuite/ld-scripts/provide-3.d: Add xfail directive.
	* testsuite/ld-scripts/provide-4.d: Use new map file name.
	* testsuite/ld-scripts/provide-5.d: Use new map file name.
	* testsuite/ld-scripts/provide-4-map.d: Renamed to...
	* testsuite/ld-scripts/provide-4.map: ...this.
	* testsuite/ld-scripts/provide-5-map.d: Renamed to...
	* testsuite/ld-scripts/provide-5.map: ...this.
	* testsuite/ld-scripts/provide.exp: Move xfail into provide-3.d
	file, and run tests in a loop.