[patch] removing gprof sentinels

[kwerner]

Hi,

The attached patch removes the <locore> and <hicore> sentinels from the gprof 
code. They were introduced back in 1994 to prevent the sym_lookup function 
from returning zero. sym_lookup takes a sorted list of Syms and a VMA and 
returns the corresponding symbol or zero if the VMA is out of range. The 
current code assumes that there is no code at address zero which isn't true 
for the SPU. I searched all occurrences of sym_lookup and added checks where 
necessary. No regressions.

Ken

gprof/ChangeLog:

2009-02-12  Ken Werner  <ken.werner@de.ibm.com>

        * corefile.c (core_create_function_syms): Remove "<locore>" and 
        "<hicore>" sentinels.
        * gprof.c: Likewise.
        * cg_print.c (cg_print_function_ordering): Likewise.
        * alpha.c (alpha_find_call): Add check for return value of sym_lookup.
        * mips.c (mips_find_call): Likewise.
        * sparc.c (sparc_find_call): Likewise.
        * tahoe.c (tahoe_find_call): Likewise.
        * vax.c (vax_find_call): Likewise.

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