Fix missing parens when function expressions is tag

[existentialism]

Q	A
Patch: Bug Fix?	yes
Major: Breaking Change?	no
Minor: New Feature?	no
Deprecations?	no
Spec Compliancy?	no
Tests Added/Pass?	yes
Fixed Tickets	Fixes #5192
License	MIT
Doc PR
Dependency Changes

[mention-bot]

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

[codecov-io]

Current coverage is 89.22% (diff: 100%)

Merging #5193 into master will increase coverage by <.01%

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+ Hits           8775       8778     +3   
  Misses         1060       1060          
  Partials          0          0          

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[loganfsmyth]

I think the function expression case is fine, it's only the arrow function that needs fixing.

[loganfsmyth]

Oh wait, I see why you added this.

function(){}`foo`

is fine as long as it is in an expression context, so I'd be in favor of expanding isFirstInStatement to handle functions in tagged templates, are you up for that? So your test output would be

(() => {})``;
(function(){}``);