pr11135: make PIC register a pseudo

[Ian Lance Taylor]

Stuart Hastings <stuart@apple.com> writes:

> Regarding
> 
> 	http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11135
> 
> How much effort would it take to fix this, at least for x86 (32-bit)?

Not hard.  See the MIPS backend, for example.  Look at how it defines
PIC_OFFSET_TABLE_REGNUM and how it handles pic_offset_table_rtx.

Ian