[Bug bootstrap/64919] bootstrap failure of gcc-4.9.2 on ia64-hpux in libgcc

[bugzilla-gcc at thewrittenword dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64919

--- Comment #35 from The Written Word <bugzilla-gcc at thewrittenword dot com> ---
I am trying to build 4.9.4 with a patched 4.7.4 and am running into the
following failure:
/opt/build/china/gcc-4.9.4/.obj/./gcc/xgcc
-B/opt/build/china/gcc-4.9.4/.obj/./gcc/
-B/opt/build/gcc49/ia64-hp-hpux11.31/bin/
-B/opt/build/gcc49/ia64-hp-hpux11.31/lib/ -isystem
/opt/build/gcc49/ia64-hp-hpux11.31/include -isystem
/opt/build/gcc49/ia64-hp-hpux11.31/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC  
 -DUSE_LIBUNWIND_EXCEPTIONS -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual
-Wno-format -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition 
-isystem ./include   -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector  
-I. -I. -I../.././gcc -I/opt/build/china/gcc-4.9.4/libgcc
-I/opt/build/china/gcc-4.9.4/libgcc/.
-I/opt/build/china/gcc-4.9.4/libgcc/../gcc
-I/opt/build/china/gcc-4.9.4/libgcc/../include  -DHAVE_CC_TLS  -o emutls.o -MT
emutls.o -MD -MP -MF emutls.dep -fexceptions -c
/opt/build/china/gcc-4.9.4/libgcc/emutls.c -fvisibility=hidden -DHIDE_EXPORTS
/opt/build/china/gcc-4.9.4/libgcc/emutls.c: In function '__emutls_get_address':
/opt/build/china/gcc-4.9.4/libgcc/emutls.c:188:1: internal compiler error: in
simplify_subreg, at simplify-rtx.c:5917
 }
 ^

Should I build this with -O0 as well?