Patterns parsing: recover from patternVariableDeclaration non-statement. Previously, if a pattern variable declaration appeared outside of a function or method, the parser would get very confused. Now it recognizes the situation, issues a comprehensible error message, and replaces the pattern with a synthetic identifier token so that the analyzer AST is somewhat sensible. Fixes #51322. Bug: https://github.com/dart-lang/sdk/issues/51322 Change-Id: Ica5f060cb483a39c4e50942d639939b1fab40bea Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/293087 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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