Optimizer: move Context.erase(instructions:) from Outliner to Context

Author: eeckstein

SwiftCompilerSources/Sources/Optimizer/FunctionPasses/ObjectOutliner.swift

@@ -506,14 +506,6 @@ private extension AllocRefInstBase {
   }
 }
 
-private extension FunctionPassContext {
-  func erase(instructions: [Instruction]) {
-    for inst in instructions {
-      erase(instruction: inst)
-    }
-  }
-}
-
 private func optimizeFindStringCall(stringArray: GlobalValueInst, _ context: FunctionPassContext) {
   if stringArray.numArrayElements > 16,
      let findStringCall = findFindStringCall(stringArray: stringArray),

SwiftCompilerSources/Sources/Optimizer/PassManager/Context.swift

@@ -153,6 +153,12 @@ extension MutatingContext {
     erase(instruction: inst)
   }
 
+  func erase<S: Sequence>(instructions: S) where S.Element: Instruction {
+    for inst in instructions {
+      erase(instruction: inst)
+    }
+  }
+
   func erase(instructionIncludingDebugUses inst: Instruction) {
     precondition(inst.results.allSatisfy { $0.uses.ignoreDebugUses.isEmpty })
     erase(instructionIncludingAllUsers: inst)