[patch] .statement("function@file.c+5")

[Stan Cox]

This supports a relative line offset for .statement.  So for example:
 .statement("function@file.c:135") would be line 135 of function in
file.c
 .statement("function@file.c+3") would be function entry line + 3 in
file.c 

So for 2.6.24.5-85.fc8:
kernel.statement("bio_init@fs/bio.c:135")
kernel.statement("bio_init@fs/bio.c+3")
yield the same thing.

A very simple example:
probe kernel.statement("bio_init@fs/bio.c+3") {
  printf ("%s -> %s\n", thread_indent(1), probefunc())
  print_stack(backtrace())
}
probe timer.ms(2000) {
  exit ()
}

yields:
  5358 hald-addon-stor(2437):     -> bio_init
 0xffffffff810c24eb : bio_init+0x19/0x21
 0xffffffff810c2521 : bio_alloc_bioset+0x2e/0xd9
 0xffffffff810c2619 : bio_alloc+0x10/0x20
 0xffffffff810c2666 : bio_map_kern+0x3d/0x103
 0xffffffff81116e2b : blk_rq_map_kern+0x2f/0x84
 0xffffffff88059413 : scsi_execute+0x57/0xe7 [scsi_mod]
 0x00000ffffffff880

(Currently working on test cases.)

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