Remove unused code, improve speed of Parser::CurrentToken (improvement seen in measurements and pro…

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
===================================================================
--- runtime/vm/compiler.cc	(revision 36705)
+++ runtime/vm/compiler.cc	(working copy)
@@ -240,21 +240,6 @@
 }
 
 
-static void InstallUnoptimizedCode(const Function& function) {
-  // Disable optimized code.
-  ASSERT(function.HasOptimizedCode());
-  if (FLAG_trace_compiler) {
-    OS::Print("--> patching entry %#" Px "\n",
-              Code::Handle(function.CurrentCode()).EntryPoint());
-  }
-  function.SwitchToUnoptimizedCode();
-  if (FLAG_trace_compiler) {
-    OS::Print("--> restoring entry at %#" Px "\n",
-              Code::Handle(function.unoptimized_code()).EntryPoint());
-  }
-}
-
-
 // Return false if bailed out.
 static bool CompileParsedFunctionHelper(ParsedFunction* parsed_function,
                                         bool optimized,
@@ -772,13 +757,6 @@
   Isolate* isolate = Isolate::Current();
   StackZone zone(isolate);
   LongJumpScope jump;
-  // Make sure unoptimized code is not collected while we are compiling.
-  const Code& unoptimized_code = Code::ZoneHandle(function.unoptimized_code());
-  // Skips parsing if we need to only install unoptimized code.
-  if (!optimized && !unoptimized_code.IsNull()) {
-    InstallUnoptimizedCode(function);
-    return Error::null();
-  }
   if (setjmp(*jump.Set()) == 0) {
     TIMERSCOPE(isolate, time_compilation);
     Timer per_compile_timer(FLAG_trace_compiler, "Compilation time");