Remove namedCaptureOffsets from MECaptureList

This doesn't appear to be used, and should be
available from the CaptureList.

Author: hamishknight

Sources/_StringProcessing/Engine/MEBuilder.swift

@@ -366,7 +366,6 @@ extension MEProgram.Builder {
       registerInfo: regInfo,
       captureList: captureList,
       referencedCaptureOffsets: referencedCaptureOffsets,
-      namedCaptureOffsets: namedCaptureOffsets,
       initialOptions: initialOptions)
   }
 

Sources/_StringProcessing/Engine/MECapture.swift

@@ -145,7 +145,6 @@ extension Processor._StoredCapture: CustomStringConvertible {
 struct MECaptureList {
   var values: Array<Processor<String>._StoredCapture>
   var referencedCaptureOffsets: [ReferenceID: Int]
-  var namedCaptureOffsets: [String: Int]
 
 //  func extract(from s: String) -> Array<Array<Substring>> {
 //    caps.map { $0.map { s[$0] }  }

Sources/_StringProcessing/Engine/MEProgram.swift

@@ -36,7 +36,6 @@ struct MEProgram<Input: Collection> where Input.Element: Equatable {
 
   let captureList: CaptureList
   let referencedCaptureOffsets: [ReferenceID: Int]
-  let namedCaptureOffsets: [String: Int]
 
   var initialOptions: MatchingOptions
 }

Sources/_StringProcessing/Executor.swift

@@ -37,8 +37,7 @@ struct Executor {
 
     let capList = MECaptureList(
       values: cpu.storedCaptures,
-      referencedCaptureOffsets: engine.program.referencedCaptureOffsets,
-      namedCaptureOffsets: engine.program.namedCaptureOffsets)
+      referencedCaptureOffsets: engine.program.referencedCaptureOffsets)
 
     let range = inputRange.lowerBound..<endIdx
     let caps = engine.program.captureList.createElements(capList, input)