StubCallInterfaceDescriptor takes a context register.

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 6afe809ac23cabd5e7fc42bfe7928fa5ffc7733a..8a0e559410870edee60b3dd99060a1fc96d0f161 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1863,11 +1863,11 @@ class LCallJSFunction V8_FINAL : public LTemplateInstruction<1, 1, 0> {
 
 class LCallWithDescriptor V8_FINAL : public LTemplateResultInstruction<1> {
  public:
-  LCallWithDescriptor(const CallInterfaceDescriptor* descriptor,
+  LCallWithDescriptor(const InterfaceDescriptor* descriptor,
                       const ZoneList<LOperand*>& operands,
                       Zone* zone)
-    : inputs_(descriptor->environment_length() + 1, zone) {
-    ASSERT(descriptor->environment_length() + 1 == operands.length());
+    : inputs_(descriptor->GetEnvironmentLength() + 1, zone) {

[danno, 2014/07/16 13:19:59]

This (and below and on other platforms should get GetRegisterParameterCount() +
1

[mvstanton, 2014/07/17 09:04:05]

Done.

+    ASSERT(descriptor->GetEnvironmentLength() + 1 == operands.length());
     inputs_.AddAll(operands, zone);
   }