[Bug bootstrap/62301] New: PowerPC bootstrap broken since r214654

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62301

            Bug ID: 62301
           Summary: PowerPC bootstrap broken since r214654
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wschmidt at gcc dot gnu.org
                CC: rdsandiford at googlemail dot com
              Host: powerpc64le-unknown-linux-gnu
            Target: powerpc64le-unknown-linux-gnu
             Build: powerpc64le-unknown-linux-gnu

Bootstrap is failing in stage 2 for powerpc64le-unknown-linux-gnu (and likely
in powerpc64-unknown-linux-gnu as well, though I have not yet confirmed this). 
I've bisected the start of the failure to r214654:

2014-08-28  Richard Sandiford  <rdsandiford@googlemail.com>                     

        * rtl.h (get_pool_constant, rtx_referenced_p): Replace rtx parameters   
        with const_rtx parameters.                                              
        * varasm.c (get_pool_constant): Likewise.                               
        * rtlanal.c (rtx_referenced_p_1): Delete.                               
        (rtx_referenced_p): Use FOR_EACH_SUBRTX instead of for_each_rtx.        
        Assert that the rtx we're looking for is nonnull.  Allow searches       
        for constant pool SYMBOL_REFs.                                          

Many compiles fail while building libgcc, all segfaulting:

/home/wschmidt/gcc/gcc-mainline-base/libgcc/libgcc2.c: In function '__ashlti3':
/home/wschmidt/gcc/gcc-mainline-base/libgcc/libgcc2.c:454:1: internal compiler
error: Segmentation fault
 }
 ^
xgcc: internal compiler error: Segmentation fault (program cc1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

I'll try to get more information in the morning.