[NFC] Update formatting of some symbolizer tests

These tests are touched in D149757 and to reduce the number of changes
in that patch, the tests are updated here. The test format is fixed
according to the rules:

  - # for actual comments;
  - RUN and CHECK lines are specified without #;
  - all comment markers should have a space between them and the rest
    of the line (e.g. # This is a comment).

In some cases lines are reordered to make CHECK commands closer to the
corresponding RUN lines.

No other changes are made.

Differential Revision: https://reviews.llvm.org/D155943