Make context register implicit for CallInterfaceDescriptors

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index cf421497943fa933cddd5599cfeb13d335bb34da..1ce0a57a6e7c1059a3553c62e5904896b64214f0 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -111,17 +111,17 @@ 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) ||
-           a0.is(descriptor.GetEnvironmentParameterRegister(param_count - 1)));
+           a0.is(descriptor.GetRegisterParameter(param_count - 1)));
     // Push arguments, adjust sp.
     __ Dsubu(sp, sp, Operand(param_count * kPointerSize));
     for (int i = 0; i < param_count; ++i) {
       // Store argument to stack.
-      __ sd(descriptor.GetEnvironmentParameterRegister(i),
+      __ sd(descriptor.GetRegisterParameter(i),
             MemOperand(sp, (param_count - 1 - i) * kPointerSize));
     }
     __ CallExternalReference(miss, param_count);