Build failure cris-elf, gcc-5 backport of PR rtl-optimization/78255 fix, gcc/postreload.c:reload_cse_simplify

[Hans-Peter Nilsson]

For cris-elf on the gcc-5-branch at r244321:

g++ -c   -g -O2 -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE  -fno-exceptions 
-fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings 
-Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic 
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H 
-I. -I. -I/tmp/hpautotest-gcc5/gcc/gcc -I/tmp/hpautotest-gcc5/gcc/gcc/. 
-I/tmp/hpautotest-gcc5/gcc/gcc/../include 
-I/tmp/hpautotest-gcc5/gcc/gcc/../libcpp/include 
-I/tmp/hpautotest-gcc5/cris-elf/gccobj/./gmp -I/tmp/hpautotest-gcc5/gcc/gmp 
-I/tmp/hpautotest-gcc5/cris-elf/gccobj/./mpfr -I/tmp/hpautotest-gcc5/gcc/mpfr 
-I/tmp/hpautotest-gcc5/gcc/mpc/src  
-I/tmp/hpautotest-gcc5/gcc/gcc/../libdecnumber 
-I/tmp/hpautotest-gcc5/gcc/gcc/../libdecnumber/dpd -I../libdecnumber 
-I/tmp/hpautotest-gcc5/gcc/gcc/../libbacktrace   -o postreload.o -MT 
postreload.o -MMD -MP -MF ./.deps/postreload.TPo 
/tmp/hpautotest-gcc5/gcc/gcc/postreload.c
/tmp/hpautotest-gcc5/gcc/gcc/postreload.c: In function 'bool 
reload_cse_simplify(rtx_insn*, rtx)':
/tmp/hpautotest-gcc5/gcc/gcc/postreload.c:125:7: error: 'NO_FUNCTION_CSE' was 
not declared in this scope
make[2]: *** [postreload.o] Error 1

This seems to be due to your backport:

2017-01-11  Andre Vieira <andre.simoesdiasvie...@arm.com>

        Backport from mainline
        2016-12-09  Andre Vieira <andre.simoesdiasvie...@arm.com>

        PR rtl-optimization/78255
        * gcc/postreload.c (reload_cse_simplify): Do not CSE a function if
        NO_FUNCTION_CSE is true.

brgds, H-P