clang-format: [JS] fix uninitialized memory.

SortJavaScriptImports attempts to set its currently parsed token to an
invalid token when it reaches the end of the line. However in doing so,
it used a `FormatToken`, which contains a `Token Tok`. `Token` does not
have a constructor, so its fields start out as uninitialized memory.

`Token::startToken()` initializes all fields. Calling it in
`JavaScriptImportSorter`'s constructor thus fixes the problem.

Differential Revision:

GitOrigin-RevId: c26729251588cb6e9e20c3edf67d14ac9b549f9b
1 file changed