SE-0414 "Typed throws" has been accepted

Drop the `typedThrows` experimental feature.

Author: DougGregor

CodeGeneration/Sources/SyntaxSupport/CommonNodes.swift

@@ -93,22 +93,19 @@ public let COMMON_NODES: [Node] = [
       Child(
         name: "leftParen",
         kind: .token(choices: [.token(.leftParen)]),
-        experimentalFeature: .typedThrows,
         documentation: "The '(' to open the thrown error type specification.",
         isOptional: true
       ),
       Child(
         name: "type",
         kind: .node(kind: .type),
-        experimentalFeature: .typedThrows,
         nameForDiagnostics: "thrown type",
         documentation: "The thrown error type.",
         isOptional: true
       ),
       Child(
         name: "rightParen",
         kind: .token(choices: [.token(.rightParen)]),
-        experimentalFeature: .typedThrows,
         documentation: "The ')' to close the thrown error type specification.",
         isOptional: true
       ),

CodeGeneration/Sources/SyntaxSupport/ExperimentalFeatures.swift

@@ -15,7 +15,6 @@ import SwiftSyntax
 public enum ExperimentalFeature: String, CaseIterable {
   case referenceBindings
   case thenStatements
-  case typedThrows
   case doExpressions
   case nonescapableTypes
   case transferringArgsAndResults
@@ -27,8 +26,6 @@ public enum ExperimentalFeature: String, CaseIterable {
       return "reference bindings"
     case .thenStatements:
       return "'then' statements"
-    case .typedThrows:
-      return "typed throws"
     case .doExpressions:
       return "'do' expressions"
     case .nonescapableTypes:

CodeGeneration/Sources/SyntaxSupport/StmtNodes.swift

@@ -219,7 +219,6 @@ public let STMT_NODES: [Node] = [
       Child(
         name: "throwsClause",
         kind: .node(kind: .throwsClause),
-        experimentalFeature: .typedThrows,
         documentation: "The clause specifying the type of errors thrown from the 'do' block.",
         isOptional: true
       ),