[arm] ld.gold crash on -flto link

[Steven Noonan]

Running on armhf board with binutils 2.24-5ubuntu3. Any attempt to use -flto with the gold linker yields this internal error:

$ cat test.c
int main(int argc, char **argv)
{
 return 0;
}
$ gcc -flto -fuse-ld=gold -o test test.c
/usr/bin/ld.gold: internal error in do_read_symbols, at ../../gold/arm.cc:6734
collect2: error: ld returned 1 exit status

This was reported to upstream a while ago, and was fixed:

https://sourceware.org/bugzilla/show_bug.cgi?id=15639

And I have tested the commit they pointed to:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f35c4853cc5b0e51d8a460be390f7a20cd44ba44

I applied this change, excluding the changes to ChangeLog (conflicts) and mips.cc (missing source file). With the change, -flto works again. Can this be pulled in to the next armhf build of binutils, please?