c++: Fix detailed-mem-stat breakage

[Nathan Sidwell]

module.cc has a	static initializer that	ends up	in a circular
dependency when detailed mem stats are enabled.	 This removes the need
for that initializer to be dynamic, and	we punt	to the lazy
initializing we already had inside the object in question anyway.  At
the cost of an additional indirection.

	gcc/cp/
         * module.cc (loc_spans): Make spans a pointer, not inline.
	Adjust all accesses.

pushing to trunk

-- 
Nathan Sidwell
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