NFC: Address deprecation warnings in ASTGen.

Author: tshortli

lib/ASTGen/Sources/ASTGen/Decls.swift

@@ -557,7 +557,7 @@ extension ASTGenVisitor {
       genericParamList: self.generate(genericParameterClause: node.genericParameterClause),
       parameterList: self.generate(functionParameterClause: node.signature.parameterClause, forSubscript: false),
       asyncSpecifierLoc: self.generateSourceLoc(node.signature.effectSpecifiers?.asyncSpecifier),
-      throwsSpecifierLoc: self.generateSourceLoc(node.signature.effectSpecifiers?.throwsSpecifier),
+      throwsSpecifierLoc: self.generateSourceLoc(node.signature.effectSpecifiers?.throwsClause?.throwsSpecifier),
       thrownType: self.generate(type: node.signature.effectSpecifiers?.thrownError),
       returnType: self.generate(type: node.signature.returnClause?.type),
       genericWhereClause: self.generate(genericWhereClause: node.genericWhereClause)
@@ -585,7 +585,7 @@ extension ASTGenVisitor {
       genericParamList: self.generate(genericParameterClause: node.genericParameterClause),
       parameterList: self.generate(functionParameterClause: node.signature.parameterClause, forSubscript: false),
       asyncSpecifierLoc: self.generateSourceLoc(node.signature.effectSpecifiers?.asyncSpecifier),
-      throwsSpecifierLoc: self.generateSourceLoc(node.signature.effectSpecifiers?.throwsSpecifier),
+      throwsSpecifierLoc: self.generateSourceLoc(node.signature.effectSpecifiers?.throwsClause?.throwsSpecifier),
       thrownType: self.generate(type: node.signature.effectSpecifiers?.thrownError),
       genericWhereClause: self.generate(genericWhereClause: node.genericWhereClause)
     )

lib/ASTGen/Sources/ASTGen/Macros.swift

@@ -567,7 +567,7 @@ func expandFreestandingMacroInProcess(
     discriminator: discriminator
   )
 
-  let macroName = expansionSyntax.macro.text
+  let macroName = expansionSyntax.macroName.text
 
   // Make sure we emit all of the diagnostics from the context.
   defer {

lib/ASTGen/Sources/ASTGen/Types.swift

@@ -298,7 +298,7 @@ extension ASTGenVisitor {
         rightParenLoc: self.generateSourceLoc(node.rightParen)
       ).asTypeRepr,
       asyncLoc: self.generateSourceLoc(node.effectSpecifiers?.asyncSpecifier),
-      throwsLoc: self.generateSourceLoc(node.effectSpecifiers?.throwsSpecifier),
+      throwsLoc: self.generateSourceLoc(node.effectSpecifiers?.throwsClause?.throwsSpecifier),
       thrownType: self.generate(type: node.effectSpecifiers?.thrownError),
       arrowLoc: self.generateSourceLoc(node.returnClause.arrow),
       resultType: generate(type: node.returnClause.type)