Bootstrap broken for mipsel-linux: gcc/global.c:1020: error: array subscript is above array bounds

[David Daney <ddaney at avtrex dot com>]

For r131631 bootstrap on mipsel-linux in stage2 I am getting:

/home/ddaney/gccsvn/trunk-build/./prev-gcc/xgcc 
-B/home/ddaney/gccsvn/trunk-build/./prev-gcc/ 
-B/home/ddaney/gccsvn/trunk-install/mipsel-linux/bin/ -c   -g -O2 
-DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute 
-pedantic -Wno-long-long 
-Wno-variadic-macros                                 
-Wno-overlength-strings -Werror -fno-common   -DHAVE_CONFIG_H -I. -I. 
-I../../trunk/gcc -I../../trunk/gcc/. -I../../trunk/gcc/../include 
-I../../trunk/gcc/../libcpp/include -I/home/ddaney/mp/include 
-I/home/ddaney/mp/include -I../../trunk/gcc/../libdecnumber 
-I../../trunk/gcc/../libdecnumber/dpd -I../libdecnumber    
../../trunk/gcc/final.c -o final.o
/home/ddaney/gccsvn/trunk-build/./prev-gcc/xgcc 
-B/home/ddaney/gccsvn/trunk-build/./prev-gcc/ 
-B/home/ddaney/gccsvn/trunk-install/mipsel-linux/bin/ -c   -g -O2 
-DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes 
-Wmissing-prototypes -Wold-style-definition -Wmissing-format-attribute 
-pedantic -Wno-long-long 
-Wno-variadic-macros                                 
-Wno-overlength-strings -Werror -fno-common   -DHAVE_CONFIG_H -I. -I. 
-I../../trunk/gcc -I../../trunk/gcc/. -I../../trunk/gcc/../include 
-I../../trunk/gcc/../libcpp/include -I/home/ddaney/mp/include 
-I/home/ddaney/mp/include -I../../trunk/gcc/../libdecnumber 
-I../../trunk/gcc/../libdecnumber/dpd -I../libdecnumber    
../../trunk/gcc/global.c -o global.o
cc1: warnings being treated as errors
../../trunk/gcc/global.c: In function 'find_reg':
../../trunk/gcc/global.c:1020: error: array subscript is above array bounds
make[3]: *** [global.o] Error 1

This is new since r131576:

http://gcc.gnu.org/ml/gcc-testresults/2008-01/msg00758.html

The configuration is identical to that successful bootstrap/test