SwiftCompilerSources: move SIL-related Context APIs from Optimizer to the SIL module

SwiftCompilerSources/Sources/SIL/Operand.swift

@@ -27,6 +27,10 @@ public struct Operand : CustomStringConvertible, NoReflectionChildren, Equatable
 
   public var value: Value { bridged.getValue().value }
 
+  public func set(to value: Value, _ context: some MutatingContext) {
+    instruction.setOperand(at: index, to: value, context)
+  }
+
   public static func ==(lhs: Operand, rhs: Operand) -> Bool {
     return lhs.bridged.op == rhs.bridged.op
   }
@@ -45,6 +49,12 @@ public struct Operand : CustomStringConvertible, NoReflectionChildren, Equatable
 
   public func canAccept(ownership: Ownership) -> Bool { bridged.canAcceptOwnership(ownership._bridged) }
 
+  public func changeOwnership(from: Ownership, to: Ownership, _ context: some MutatingContext) {
+    context.notifyInstructionsChanged()
+    bridged.changeOwnership(from._bridged, to._bridged)
+    context.notifyInstructionChanged(instruction)
+  }
+
   public var description: String { "operand #\(index) of \(instruction)" }
 }
 
@@ -185,6 +195,12 @@ extension Sequence where Element == Operand {
   public func users<I: Instruction>(ofType: I.Type) -> LazyMapSequence<LazyFilterSequence<Self>, I> {
     self.lazy.filter{ $0.instruction is I }.lazy.map { $0.instruction as! I }
   }
+
+  public func replaceAll(with replacement: Value, _ context: some MutatingContext) {
+    for use in self {
+      use.set(to: replacement, context)
+    }
+  }
 }
 
 extension Value {