MIPS: Lazily save double registers for HCallRuntime instructions within Hydrogen code stubs.

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 84105cae35fe0801b5db1f093e9aaa15e3cf2382..f261f4272a8ddb16382d3e1608c644d3fba0b44e 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -245,7 +245,8 @@ class LCodeGen V8_FINAL  BASE_EMBEDDED {
 
   void CallRuntime(const Runtime::Function* function,
                    int num_arguments,
-                   LInstruction* instr);
+                   LInstruction* instr,
+                   SaveFPRegsMode save_doubles = kDontSaveFPRegs);
 
   void CallRuntime(Runtime::FunctionId id,
                    int num_arguments,