[WIP] [Parser] Decouple the parser from AST creation (part 3.1) #26738
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Instead of creating the AST directly in the parser (and libSyntax or SwiftSyntax via SyntaxParsingContext), make Parser to explicitly create a tree of ParsedSyntaxNodes. Their OpaqueSyntaxNodes can be either libSyntax or SwiftSyntax. If AST is needed, it can be generated from the libSyntax tree.
This PR contains the refactor of a few parsing methods for expressions.
This PR is a part of a Google Summer of Code 2019 project.
Work in progress, depends on #26478.