Allow constant global VAR_DECLs in constant jump functions

Allow constant global VAR_DECLs in constant jump functions

2016-05-18  Martin Jambor  <mjambor@suse.cz>

	PR ipa/69708
	* ipa-cp.c (ipa_get_jf_pass_through_result): Allow non-ip constant
	input for NOP_EXPR pass-through functions.
	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Allow
	aggregate global constant VAR_DECLs in constant jump functions.

testsuite/
	* gcc.dg/ipa/iinline-cstagg-2.c: New test.
	* gcc.dg/ipa/ipcp-cstagg-5.c: Likewise.
	* gcc.dg/ipa/ipcp-cstagg-6.c: Likewise.
	* gcc.dg/ipa/ipcp-cstagg-7.c: Likewise.

From-SVN: r236418