MIPS: Minor-key-ify four stubs.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index f1eaeed281b05bf5eef94e12a9f1fe35d515e776..655ae2c3e2f129615c9a3f7ccd60f6308fd76590 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -395,8 +395,7 @@ void MacroAssembler::RememberedSetHelper(Register object,  // For debug tests.
     Ret(eq, t8, Operand(zero_reg));
   }
   push(ra);
-  StoreBufferOverflowStub store_buffer_overflow =
-      StoreBufferOverflowStub(isolate(), fp_mode);
+  StoreBufferOverflowStub store_buffer_overflow(isolate(), fp_mode);
   CallStub(&store_buffer_overflow);
   pop(ra);
   bind(&done);