Rintaro Ishizaki fb08a92f48 [ASTGen] Infrastructure to implment ASTGen Incrementally ...

* 'ASTGenVisitor' has a reference to a legacy C++ Parser configured for
  ASTGen.
* If 'ASTGenVisitor' encounters a AST node that hasn't been migrated,
  call parse(Decl|Stmt|Expr|Type) to parse the position using the legacy
  parser.
* The legacy parser calls ASTGen's
  'swift_ASTGen_build(Decl|Stmt|Expr|Type)' for each ASTNode "parsing"
  (unless the call is not directly from the ASTGen.)

rdar://117151886

2023-11-12 21:43:08 -08:00

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