[Bug middle-end/61462] New: ICE in ipa-prop.c:2562 caused by missing edge gimple call stmt

["mliska at suse dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61462

            Bug ID: 61462
           Summary: ICE in ipa-prop.c:2562 caused by missing edge gimple
                    call stmt
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mliska at suse dot cz

Created attachment 32914
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32914&action=edit
Suggested patch

Problem was met during run of gimp with following flags:
'-flto -fdump-ipa-all'.

backtrace:
lto1: internal compiler error: Segmentation fault
0x8321af crash_signal
    ../../gcc/toplev.c:337
0x6e5297 gimple_location
    ../../gcc/gimple.h:1499
0x6ebe06 ipa_make_edge_direct_to_target(cgraph_edge*, tree_node*)
    ../../gcc/ipa-prop.c:2562
0xc923a1 ipcp_discover_new_direct_edges
    ../../gcc/ipa-cp.c:2373
0xc923a1 create_specialized_node
    ../../gcc/ipa-cp.c:2821
0xc96b7f decide_whether_version_node
    ../../gcc/ipa-cp.c:3557
0xc96b7f ipcp_decision_stage
    ../../gcc/ipa-cp.c:3669
0xc96b7f ipcp_driver
    ../../gcc/ipa-cp.c:3715
0xc96b7f execute
    ../../gcc/ipa-cp.c:3807

Problem is that in LTO there's a virtual 'constprop' clone created by ipa-cp.
An edge for this newly created node has e->stmt == NULL.

Introduced in 210657.