* gdb.cp/mb-ctor.exp: Add multi-line source statement test.

	* gdb.cp/mb-ctor.exp: Add multi-line source statement test.
	* gdb.cp/mb-ctor.cc: Ditto.
	* gdb.cp/mb-inline.exp: Add multi-line source statement test.
	* gdb.cp/mb-inline.h (multi_line_foo): New function.
	* gdb.cp/mb-inline1.cc: Call it.
	* gdb.cp/mb-inline2.cc: Ditto.
	* gdb.cp/mb-templates.exp: Add multi-line source statement test.
	* gdb.cp/mb-templates.cc (multi_line_foo): New template.