Parser refactoring (#11871)

* refactor: parseMaybeUnary => parseUnary

* refactor: extract shouldExitDescending method

* refactor: add parseUpdate

* refactor: avoid comparing with hardcoded token value

* refactor: add ParseNewOrNewTarget

* refactor: add parseCoverCallAndAsyncArrowHead

* add parseBind

* refactor: polish parseTaggedTemplateExpression interface

* refactor: add parseMember method

* refactor: add parseSuper method

* refactor: add parseAsyncArrowUnaryFunction method

* fix: disallow line break before async binding arrow

* refactor: simplify tt.name logic

* refactor: add parseDo method

* refactor: misc

* refactor: rename parseObjectMember by parsePropertyDefinition

* refactor: unify set/get/async keyword parsing in ObjectMethod

* refactor: misc

* refactor: add parseArrayLike method

* refactor: move fsharp epilogure and prologue inside parseObjectLike

* fixup

* refactor: rename parseFunctionExpression to parseFunctionOrFunctionSent

* refactor: remove redundant logic

* refactor: rename parseClassPropertyName by parseClassElementName

* refactor: avoid unecessary lookahead when parsing tt._export

* fix: export-default-from should support escaped async as export binding

* address review comments

* parseUnary -> parseMaybeUnary

packages/babel-parser/src/parser/error-message.js

@@ -80,6 +80,7 @@ export const ErrorMessages = Object.freeze({
   LabelRedeclaration: "Label '%0' is already declared",
   LetInLexicalBinding:
     "'let' is not allowed to be used as a name in 'let' or 'const' declarations.",
+  LineTerminatorBeforeArrow: "No line break is allowed before '=>'",
   MalformedRegExpFlags: "Invalid regular expression flag",
   MissingClassName: "A class name is required",
   MissingEqInAssignment: