arc: Update arc specific tests

arc: Update arc specific tests

Update assembly output test pattern. Take into consideration also for
which platform we do execute the test (baremetal or linux).

gcc/testsuite/ChangeLog:

	* gcc.target/arc/add_n-combine.c: Update test patterns.
	* gcc.target/arc/builtin_eh.c: Update test for linux platforms.
	* gcc.target/arc/mul64-1.c: Disable this test while running on
	linux.
	* gcc.target/arc/tls-gd.c: Update matching patterns.
	* gcc.target/arc/tls-ie.c: Likewise.
	* gcc.target/arc/tls-ld.c: Likewise.
	* gcc.target/arc/uncached-8.c: Likewise.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>