jit.exp: add __func__ to help test-{combination|threads}.c

jit.exp: add __func__ to help test-{combination|threads}.c

gcc/testsuite/ChangeLog:
	* jit.dg/harness.h (CHECK_NON_NULL): Add __func__ to output, to
	make it easier to figure out the origin of each test result when
	running test-combination.c and test-threads.c.
	(CHECK_VALUE): Likewise.
	(CHECK_DOUBLE_VALUE): Likewise.
	(CHECK_STRING_VALUE): Likewise.
	(CHECK_STRING_STARTS_WITH): Likewise.
	(CHECK_STRING_CONTAINS): Likewise.
	(CHECK): Likewise.
	(check_string_value): Likewise, add "funcname" param.
	(check_string_starts_with): Likewise.
	(check_string_contains): Likewise.

From-SVN: r219314