Simplify invocation sequence at monomorphic function invocation sites.

src/mips/lithium-codegen-mips.h

Index: src/mips/lithium-codegen-mips.h
diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index b5082561e0061642a8c4c5854cb80f6809789832..94bb945b311a16c74f6a115b2d1b4103a31fa718 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -212,12 +212,18 @@ class LCodeGen BASE_EMBEDDED {
                                int argc,
                                LInstruction* instr);
 
+  enum A1State {
+    A1_UNINITIALIZED,
+    A1_CONTAINS_TARGET
+  };
+
   // Generate a direct call to a known function.  Expects the function
   // to be in a1.
   void CallKnownFunction(Handle<JSFunction> function,
                          int arity,
                          LInstruction* instr,
-                         CallKind call_kind);
+                         CallKind call_kind,
+                         A1State a1_state);
 
   void LoadHeapObject(Register result, Handle<HeapObject> object);