[4.2] Bring the new PlaygroundLogger implementation into swift-4.2-branch

Experimental/PlaygroundRuntime/PlaygroundRuntime.xcodeproj/project.pbxproj

@@ -0,0 +1,342 @@
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Experimental/PlaygroundRuntime/PlaygroundRuntime/Info.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

Experimental/PlaygroundRuntime/PlaygroundRuntime/PCMacroRuntime.swift

@@ -0,0 +1,18 @@
+//===--- PCMacroRuntime.swift ---------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+fileprivate func unsetPCFunction(_: Int, _: Int, _: Int, _: Int) {
+    fatalError("PC macro runtime uninitialized")
+}
+
+public var __builtin_pc_before: @convention(thin) (Int, Int, Int, Int) -> Void = unsetPCFunction
+public var __builtin_pc_after: @convention(thin) (Int, Int, Int, Int) -> Void = unsetPCFunction