[PATCH, ARM] Fix Thumb-1 reload ICE with nested functions

[Paul Brook]

>     gcc/
>     * config/arm/arm.h (REG_CLASS_CONTENTS): Remove soft frame pointer
>     from CORE_REGS and GENERAL_REGS classes.
>     * config/arm/arm.md (*thumb1_movsi_insn): Ignore all parts of final
>     constraint for register preferencing.

Ok.

For the record, I initially had concerns that this might prevent high 
registers being used at all (using stack spill slots instead). These concerns 
turned out to be unfounded.

Paul