Ignore "mapping symbols" like $a and $t. They seem to be an ARM-only

feature, used to indicate whether code is ARM or Thumb. Unfortunately
they confuse gprof, which outputs call graphs where every other function
is named "$a"... not very useful.

Rather than enumerating the different symbols, binutils ignores anything
beginning with '$', and that is what we will do here.

Thanks to Dale Rahn for useful tips along the way.
ok miod

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