Fix infinite loop in flow declare module parsing

[alangpierce]

No description provided.

[codecov-io]

Codecov Report

Merging #359 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
+ Coverage   79.15%   79.24%   +0.08%     
==========================================
  Files          44       44              
  Lines        5066     4847     -219     
  Branches     1133     1133              
==========================================
- Hits         4010     3841     -169     
+ Misses        759      706      -53     
- Partials      297      300       +3

Impacted Files	Coverage Δ
src/parser/plugins/flow.ts	63.72% <100%> (+2.97%)	⬆️
src/util/getNonTypeIdentifiers.ts	75% <0%> (-25%)	⬇️
src/parser/index.ts	77.77% <0%> (-7.94%)	⬇️
src/index.ts	82.85% <0%> (-6.51%)	⬇️
src/computeSourceMap.ts	83.33% <0%> (-5.56%)	⬇️
src/parser/plugins/types.ts	90% <0%> (-4.45%)	⬇️
src/util/getTSImportedNames.ts	76.31% <0%> (-4.18%)	⬇️
src/parser/tokenizer/readWord.ts	81.81% <0%> (-3.19%)	⬇️
src/parser/traverser/util.ts	86.2% <0%> (-2.17%)	⬇️
src/parser/traverser/base.ts	95.45% <0%> (-1.69%)	⬇️
... and 14 more

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