Matches pattern cleanup

[jridgewell]

Q	A
Patch: Bug Fix?	No
Major: Breaking Change?	No
Minor: New Feature?	No
Deprecations?	No
Spec Compliancy?	No
Tests Added/Pass?	Yes
Fixed Tickets
License	MIT
Doc PR
Dependency Changes

We have matchesPattern duplicated in babel-types and babel-traverse. This dedupes to the babel-types version, and reimplements it to make it understandable.

[mention-bot]

@jridgewell, thanks for your PR! By analyzing the history of the files in this pull request, we identified @zertosh, @hzoo and @gaearon to be potential reviewers.

[codecov]

Codecov Report

Merging #5826 into 7.0 will increase coverage by 0.1%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##              7.0    #5826     +/-   ##
=========================================
+ Coverage   84.95%   85.06%   +0.1%     
=========================================
  Files         284      284             
  Lines        9933     9904     -29     
  Branches     2781     2774      -7     
=========================================
- Hits         8439     8425     -14     
+ Misses        982      980      -2     
+ Partials      512      499     -13

Impacted Files	Coverage Δ
packages/babel-traverse/src/path/introspection.js	46.52% <100%> (+1.28%)	⬆️
packages/babel-types/src/index.js	87.84% <100%> (+4.23%)	⬆️
packages/babel-helper-fixtures/src/index.js	71.62% <0%> (-4.06%)	⬇️
packages/babel-helper-call-delegate/src/index.js	64% <0%> (-4%)	⬇️
packages/babel-traverse/src/path/context.js	85.34% <0%> (-1.73%)	⬇️
packages/babel-traverse/src/path/modification.js	72.11% <0%> (-0.97%)	⬇️
packages/babel-traverse/src/visitors.js	85.71% <0%> (-0.96%)	⬇️
packages/babel-types/src/definitions/es2015.js	96.15% <0%> (-0.52%)	⬇️
packages/babel-types/src/definitions/core.js	98.21% <0%> (-0.32%)	⬇️
...bel-plugin-transform-es2015-classes/src/vanilla.js	90.63% <0%> (ø)	⬆️
... and 4 more

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