[commit] Eliminate prev_func_name global

[Andrew Cagney]

Hello,

This patch eliminates the global prev_func_name from "infrun.c".  See: 
http://sources.redhat.com/ml/gdb-patches/2003-04/msg00316.html for the 
rationale.

Rather than doing a GDB wide introduction of pc_in_sigtramp(pc), I've 
kept it local to "infrun.c".  I found that the other PC_IN_SIGTRAMP 
calls looked like candidates for replacement with ``get_frame_type() == 
SIGTRAMP_FRAME''.

committed,
Andrew
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