[Bug target/54029] New: SH: Fix ICE in find_dead_or_set_registers

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54029

             Bug #: 54029
           Summary: SH: Fix ICE in find_dead_or_set_registers
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: chrbr@gcc.gnu.org


Created attachment 27831
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27831
preprocessed file.  Compiles with -O2

This is a SH regression on the 4.7 and trunk while building Webkit
(pre-processed file size is about 2.2Mb 

A far branch to a return rtx produces an ICE in
find_dead_or_set_registers at line resource.c:497:

next = JUMP_LABEL (this_jump_insn);
if (ANY_RETURN_P (next)) <- next is null
 next = NULL_RTX;

Turns out that JUMP_LABEL was not set after gen_return in
sh.c:gen_far_branch.

Reproduce with a sh4-linux-g++ or sh-superh-elf-g++ 4.7.1 and above