[patch] SPU gprof support

[Ken Werner]

Hi,

this patch adds initial support for the GNU profiler on the SPU. The flat 
profile is based on a histogram that is created using the sampling mechanism 
provided by spu_timer.h (http://sourceware.org/ml/newlib/2008/msg00316.html). 
For the call graph the compiler generates a particular prologue that causes 
every function to call _mcount. The call graph is stored in PPU memory using 
the named address space support 
(http://sourceware.org/ml/newlib/2008/msg00600.html).

Ken

libgloss/ChangeLog:

2008-11-26  Ken Werner  <ken.werner@de.ibm.com

        * spu/crt0.S: Call __monstartup if profiling is enabled.
        * spu/Makefile.in: Add gcrt1.o gcrt2.o.

newlib/ChangeLog:

2008-11-26  Ken Werner  <ken.werner@de.ibm.com>

        * libc/machine/spu/Makefile.am: Add spu-mcount.S spu-gmon.c.
        * libc/machine/spu/spu-gmon.c: New file.
        * libc/machine/spu/spu-mcount.S: New file.
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