LifetimeDependence: clarify log headers

Author: atrick

SwiftCompilerSources/Sources/Optimizer/FunctionPasses/LifetimeDependenceDiagnostics.swift

@@ -32,7 +32,7 @@ let lifetimeDependenceDiagnosticsPass = FunctionPass(
   if !context.options.hasFeature(.NonescapableTypes) {
     return
   }
-  log("Diagnosing lifetime dependence in \(function.name)")
+  log(" --- Diagnosing lifetime dependence in \(function.name)")
   log("\(function)")
 
   for argument in function.arguments where !argument.type.isEscapable {

SwiftCompilerSources/Sources/Optimizer/FunctionPasses/LifetimeDependenceInsertion.swift

@@ -34,7 +34,7 @@ let lifetimeDependenceInsertionPass = FunctionPass(
   if !context.options.hasFeature(.NonescapableTypes) {
     return
   }
-  log("Inserting lifetime dependence markers in \(function.name)")
+  log(" --- Inserting lifetime dependence markers in \(function.name)")
 
   for instruction in function.instructions {
     if let dependentApply = LifetimeDependentApply(instruction) {

SwiftCompilerSources/Sources/Optimizer/FunctionPasses/LifetimeDependenceScopeFixup.swift

@@ -31,7 +31,7 @@ private func log(_ message: @autoclosure () -> String) {
 let lifetimeDependenceScopeFixupPass = FunctionPass(
   name: "lifetime-dependence-scope-fixup")
 { (function: Function, context: FunctionPassContext) in
-  log("Scope fixup for lifetime dependence in \(function.name)")
+  log(" --- Scope fixup for lifetime dependence in \(function.name)")
 
   for instruction in function.instructions {
     guard let markDep = instruction as? MarkDependenceInst else {