Constant fold view increment expressions

The idea here is to replace expressions like v + 1 + 1 + 1 with v + 3.

	* dwarf2dbg.c (set_or_check_view): Remove useless assertion.
	Resolve multiple view increments.
	* testsuite/gas/elf/dwarf2-18.d: Don't xfail mep.
2 files changed