[Bug debug/49294] New: [4.7 Regression] ICE: in mem_loc_descriptor, at dwarf2out.c:14636 with -O -g

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49294

           Summary: [4.7 Regression] ICE: in mem_loc_descriptor, at
                    dwarf2out.c:14636 with -O -g
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 24440
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24440
reduced testcase

Compiler output:
$ gcc -O -g testcase.c 
testcase.c: In function 'foo':
testcase.c:19:1: internal compiler error: in mem_loc_descriptor, at
dwarf2out.c:14636
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r174655 - crash
4.6 r173059 - OK