Uses an object pool on x64

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
===================================================================
--- runtime/vm/intermediate_language_x64.cc	(revision 26436)
+++ runtime/vm/intermediate_language_x64.cc	(working copy)
@@ -96,20 +96,16 @@
     __ Bind(&done);
   }
 #endif
-  __ LeaveFrame();
+  __ LeaveFrame(true);
   __ ret();
 
-  // Generate 8 bytes of NOPs so that the debugger can patch the
+  // Generate 4 bytes of NOPs so that the debugger can patch the
   // return pattern with a call to the debug stub.
   // Note that the nop(8) byte pattern is not recognized by the debugger.
   __ nop(1);
   __ nop(1);
   __ nop(1);
   __ nop(1);
-  __ nop(1);
-  __ nop(1);
-  __ nop(1);
-  __ nop(1);
   compiler->AddCurrentDescriptor(PcDescriptors::kReturn,
                                  Isolate::kNoDeoptId,
                                  token_pos());
@@ -2230,6 +2226,10 @@
                                 try_index(),
                                 compiler->assembler()->CodeSize(),
                                 catch_handler_types_);
+
+  // Restore the pool pointer.
+  __ LoadPoolPointer();
+
   if (HasParallelMove()) {
     compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
   }