[Bug rtl-optimization/48182] New: ICE: SIGSEGV in try_crossjump_to_edge (cfgcleanup.c:1703) with --param min-crossjump-insns=0 on basic code

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48182

           Summary: ICE: SIGSEGV in try_crossjump_to_edge
                    (cfgcleanup.c:1703) with --param min-crossjump-insns=0
                    on basic code
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 23706
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23706
reduced testcase

Compiler output:
$ gcc -fcrossjumping --param min-crossjump-insns=0 testcase.c
-fcombine-stack-adjustments
==1021== Invalid read of size 2
==1021==    at 0xF68F3C: try_crossjump_to_edge (cfgcleanup.c:1703)
==1021==    by 0xF6AE27: try_crossjump_bb (cfgcleanup.c:1875)
==1021==    by 0xF6BDBA: cleanup_cfg (cfgcleanup.c:2475)
==1021==    by 0xFAC2F0: rest_of_handle_stack_adjustments
(combine-stack-adj.c:554)
==1021==    by 0x7F9C45: execute_one_pass (passes.c:1556)
==1021==    by 0x7F9F34: execute_pass_list (passes.c:1611)
==1021==    by 0x7F9F46: execute_pass_list (passes.c:1612)
==1021==    by 0x7F9F46: execute_pass_list (passes.c:1612)
==1021==    by 0x93E3F5: tree_rest_of_compilation (tree-optimize.c:422)
==1021==    by 0xB0E3E1: cgraph_expand_function (cgraphunit.c:1576)
==1021==    by 0xB10E2C: cgraph_optimize (cgraphunit.c:1733)
==1021==    by 0xB110B9: cgraph_finalize_compilation_unit (cgraphunit.c:1096)
==1021==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==1021== 
testcase.c: In function 'foo':
testcase.c:7:1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Originally, it crashed with "-O2 --param min-crossjump-insns=0", so this isn't
a case of running random passes at -O0. 

Tested revisions:
171088 - crash
4.0.4 - 4.6 - crash
3.4.6 - doesn't know min-crossjump-insns