Teach suppressions.py to match mod!ellipsis frames in DrMemory suppressions.
Teach suppressions.py to match mod!ellipsis frames in DrMemory suppressions.

This matches DrMemory's suppression matcher more closely.  I also taught
it to match the module as a case-insensitive name, which is also
consistent with DrMemory.

R=timurrrr@chromium.org
TEST=added tests to tools/valgrind/suppressions.py
BUG=

Review URL: https://chromiumcodereview.appspot.com/9515013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@124236 0039d316-1c4b-4281-b951-d872f2087c98

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