[Bug gcov-profile/59527] New: [4.9 Regression] ICE: in fixup_reorder_chain, at cfgrtl.c:3739 during PGO Firefox build

[octoploid at yandex dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59527

            Bug ID: 59527
           Summary: [4.9 Regression] ICE: in fixup_reorder_chain, at
                    cfgrtl.c:3739 during PGO Firefox build
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: octoploid at yandex dot com

src % /var/tmp/gcc_test/usr/local/bin/g++ -w -r -nostdlib -o js -flto=4
-fprofile-use -fprofile-correction -march=native -fno-rtti -fno-exceptions
-fno-math-errno -std=gnu++0x -pthread -pipe -O3 Unified_cpp_9.ii
...
/var/tmp/mozilla-central/js/src/vm/Stack.cpp: In member function ‘operator++’:
/var/tmp/mozilla-central/js/src/vm/Stack.cpp:717:1: internal compiler error: in
fixup_reorder_chain, at cfgrtl.c:3739
 }
 ^
0x5b594c fixup_reorder_chain
        ../../gcc/gcc/cfgrtl.c:3738
0x5b594c cfg_layout_finalize()
        ../../gcc/gcc/cfgrtl.c:4295
0xd42eb2 duplicate_computed_gotos
        ../../gcc/gcc/bb-reorder.c:2492
0xd42eb2 execute
        ../../gcc/gcc/bb-reorder.c:2524
Please submit a full bug report,

-fno-reorder-blocks-and-partition fixes the issue.

I'm currently reducing this further.