Make context register implicit for CallInterfaceDescriptors

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 91958652725464678ed0a5b82731a9b162721a4a..072634978ca25b7f8ea68ffb0b2edfeb8c0c94e1 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -106,15 +106,15 @@ void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm,
   isolate()->counters()->code_stubs()->Increment();
 
   CallInterfaceDescriptor descriptor = GetCallInterfaceDescriptor();
-  int param_count = descriptor.GetEnvironmentParameterCount();
+  int param_count = descriptor.GetRegisterParameterCount();
   {
     // Call the runtime system in a fresh internal frame.
     FrameScope scope(masm, StackFrame::INTERNAL);
     DCHECK(param_count == 0 ||
-           eax.is(descriptor.GetEnvironmentParameterRegister(param_count - 1)));
+           eax.is(descriptor.GetRegisterParameter(param_count - 1)));
     // Push arguments
     for (int i = 0; i < param_count; ++i) {
-      __ push(descriptor.GetEnvironmentParameterRegister(i));
+      __ push(descriptor.GetRegisterParameter(i));
     }
     __ CallExternalReference(miss, param_count);
   }