[Bug tree-optimization/68592] New: [6 Regression] ICE in vect_get_vec_def_for_operand, at tree-vect-stmts.c:1403 with -fprofile-generate

["miyuki at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68592

            Bug ID: 68592
           Summary: [6 Regression] ICE in vect_get_vec_def_for_operand, at
                    tree-vect-stmts.c:1403 with -fprofile-generate
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: miyuki at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu
             Build: x86_64-pc-linux-gnu

This ICE started to show up during LTO build of 416.gamess with
-fprofile-generate.
r230895 - OK
r230981 - ICE

$ cat gamess_min.f 
      PARAMETER (MXCPGA=320,ZERO=0.0)
      DIMENSION CPNORM(MXCPGA),CDNORM(MXCPGA),
     *          CFNORM(MXCPGA)  
         KTYPIL        = KTYPI()
         DO 84 K=1,NOGTF
           LMP=LMP+1
           CFNORM(LMP)=ZERO
           IF (KTYPIL.EQ.1) LMP=CMPILMP
           IF (KTYPIL.EQ.2) CPNORM(LMP)=CMPILMP
           IF (KTYPIL.EQ.3) CDNORM(LMP)=CMPILMP
           IF (KTYPIL.EQ.4) LMP=CMPILMP
           IF (KTYPIL.EQ.6) LMP=CMPILMP
   84    CONTINUE
         CALL MMPNOR(CPNORM,CDNORM,CFNORM) 
      END

$ f951 -Ofast -march=haswell -fprofile-generate -quiet gamess_min.f 
gamess_min.f:1:0:

       PARAMETER (MXCPGA=320,ZERO=0.0)


internal compiler error: in vect_get_vec_def_for_operand, at
tree-vect-stmts.c:1403
0xd777c9 vect_get_vec_def_for_operand(tree_node*, gimple*, tree_node*)
        /home/miyuki/gcc/src/gcc/tree-vect-stmts.c:1403
0xd83629 vectorizable_conversion
        /home/miyuki/gcc/src/gcc/tree-vect-stmts.c:3991
0xd8ed2a vect_transform_stmt(gimple*, gimple_stmt_iterator*, bool*, _slp_tree*,
_slp_instance*)
        /home/miyuki/gcc/src/gcc/tree-vect-stmts.c:8049
0xd94f84 vect_transform_loop(_loop_vec_info*)
        /home/miyuki/gcc/src/gcc/tree-vect-loop.c:6858
0xdb0a17 vectorize_loops()
        /home/miyuki/gcc/src/gcc/tree-vectorizer.c:548
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