Change the x64 optimizing compiler to stop using the fixed context register rsi.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 34c5beb38d88d0c5dffdc3567fd7bf240cdf4a2e..a2bdad0b5599c213b768210b4da1e7767110832e 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1079,11 +1079,12 @@ LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
 
 LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
     HInstanceOfKnownGlobal* instr) {
+
+  LOperand* left = UseFixed(instr->left(), InstanceofStub::left());
+  LOperand* temp = FixedTemp(edi);
+  LOperand* context = UseFixed(instr->context(), esi);
   LInstanceOfKnownGlobal* result =
-      new LInstanceOfKnownGlobal(
-          UseFixed(instr->context(), esi),
-          UseFixed(instr->left(), InstanceofStub::left()),
-          FixedTemp(edi));
+      new LInstanceOfKnownGlobal(context, left, temp);
   return MarkAsCall(DefineFixed(result, eax), instr);
 }
 
@@ -1243,7 +1244,8 @@ LInstruction* LChunkBuilder::DoCallFunction(HCallFunction* instr) {
 LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
   argument_count_ -= instr->argument_count();
   LOperand* context = UseFixed(instr->context(), esi);
-  return MarkAsCall(DefineFixed(new LCallRuntime(context), eax), instr);
+  LCallRuntime* result = new LCallRuntime(context);
+  return MarkAsCall(DefineFixed(result, eax), instr);
 }