re PR tree-optimization/60002 (ICE: SIGSEGV in skip_artificial_parms_for() with -O2 -fcompare-debug -fdeclone-ctor-dtor -fipa-cp-clone)

	PR tree-optimization/60002
	* cgraphclones.c (build_function_decl_skip_args): Clear
	DECL_LANG_SPECIFIC.

	* g++.dg/opt/pr60002.C: New test.

From-SVN: r207465