Remove workaround for SR-1457 now that it has been fixed.

Author: abertelrud

Sources/Build/ToolProtocol.swift

@@ -84,13 +84,7 @@ struct SwiftcTool: ToolProtocol {
     var objects: [AbsolutePath]             { return module.sources.relativePaths.map{ tempsPath.appending(RelativePath($0.asString + ".o")) } }
     var sources: [AbsolutePath]             { return module.sources.paths }
     var isLibrary: Bool                     { return module.type == .library }
-    var enableWholeModuleOptimization: Bool {
-        #if EnableWorkaroundForSR1457
-            return false
-        #else
-            return conf == .release
-        #endif
-    }
+    var enableWholeModuleOptimization: Bool { return conf == .release }
 
     func append(to stream: OutputByteStream) {
         stream <<< "    tool: swift-compiler\n"

Utilities/bootstrap

@@ -203,9 +203,6 @@ class Target(object):
         compile_swift_node = '<compile-swift-%s>' % (self.name,)
         link_input_nodes.append(compile_swift_node)
 
-        # Enable the workaround for SR-1457 until it is fixed.
-        other_args.extend(["-DEnableWorkaroundForSR1457"])
-
         if args.libdispatch_source_dir:
             other_args.extend(["-Xcc", "-fblocks"])