re PR c++/4803 (Inline function never defined)

cp:
	PR c++/4803
	* decl2.c (mark_used): Defer inline functions.
	(finish_file): Merge deferred_fns loops. Check all used
	inline functions have a definition.
	* method.c (make_thunk): Thunks are not inline.
testsuite:
	* g++.dg/warn/inline1.C: New test.
	* g++.old-deja/g++.brendan/crash64.C: Remove spurious inlines.
	* g++.old-deja/g++.jason/synth10.C: Likewise.
	* g++.old-deja/g++.mike/net31.C: Likewise.
	* g++.old-deja/g++.mike/p8786.C: Likewise.

From-SVN: r60521