re PR ipa/66896 (ipa-prop.c:2479 runtime error: member call on null pointer of type 'struct ipa_polymorphic_call_context')

Fix PR ipa/66896.

	* g++.dg/ipa/pr66896.c: New test.
	PR ipa/66896.
	* ipa-prop.c (update_jump_functions_after_inlining): Create properly
	dst_ctx if it does not exist.

From-SVN: r225887