callgrind_annotate, cg_annotate: don't truncate function names at '#'

callgrind_annotate, cg_annotate: don't truncate function names at '#'

C++ function names can contain substrings like "{lambda()#1}".  But
callgrind_annotate and cg_annotate interpret the '#'-character as a
comment marker anywhere on each input line, and thus truncate such names
there.

On the other hand, the documentation in docs/cl-format.xml, states:

  Everywhere, comments on own lines starting with '#' are allowed.

This seems to imply that a comment line must start with '#' in the first
column.  Thus skip exactly such lines in the input file and don't handle
'#' as a comment marker anywhere else.

Signed-off-by: Philippe Waroquiers <philippe.waroquiers@skynet.be>