Patterns parsing: fix record-typed variable patterns before certain tokens. Previously, if a record-typed variable pattern lacked a `var` or `final` keyword, and was followed by one of the tokens `||`, `&&`, `as`, `?`, `!`, `when`, or `=>`, the parser would fail to recognize it. This happened because the call to `computeVariablePatternType` wasn't passing `true` for the optional parameter `required`; that in turn placed `computeType` in a mode where it believed it was parsing a potentially ambiguous construct in a top-level declaration, and hence it would only accept the record type if the variable name was followed by something that looked like part of a correct declaration (e.g. a comma). The fix is to pass `true` for the optional parameter `required` of `computeVariablePatternType`. This places `computeType` in a mode where it accepts the record type regardless of what follows it. This is correct behavior since at the point where a variable pattern is being parsed, ambiguities have already been taken care of and the construct being parsed is most definitely a variable pattern. Fixes #52521. Change-Id: If20772ad914827a29df45c27eefb382ec1f470d2 Bug: https://github.com/dart-lang/sdk/issues/52521 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/305848 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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