Disconnects code objects from infrequently used unoptimized functions.

runtime/vm/assembler_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
@@ skipping 2789 matching lines @@
 
 void Assembler::EnterDartFrameWithInfo(intptr_t frame_size,
                                        Register new_pp, Register new_pc) {
   if (new_pc == kNoRegister) {
     EnterDartFrame(0);
   } else {
     EnterFrame(0);
     pushq(new_pc);
     pushq(PP);
     movq(PP, new_pp);
-  }
-  if (frame_size != 0) {
-    subq(RSP, Immediate(frame_size));
+    if (frame_size != 0) {
+      subq(RSP, Immediate(frame_size));
+    }
   }
 }
 
 
 // On entry to a function compiled for OSR, the caller's frame pointer, the
 // stack locals, and any copied parameters are already in place.  The frame
 // pointer is already set up.  The PC marker is not correct for the
 // optimized function and there may be extra space for spill slots to
 // allocate.
 void Assembler::EnterOsrFrame(intptr_t extra_size,
@@ skipping 262 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
   return xmm_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64