MIPS: Use weak cells in map checks in polymorphic ICs.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index 3600e57e86326ccab03b0183f1fbd46f69f67d8e..b621e868a736658a4644c435fbe0c8b1a8fb31fa 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -4000,7 +4000,7 @@ void MacroAssembler::LoadWeakValue(Register value, Handle<WeakCell> cell,
                                    Label* miss) {
   li(value, Operand(cell));
   ld(value, FieldMemOperand(value, WeakCell::kValueOffset));
-  JumpIfNotSmi(value, miss);
+  JumpIfSmi(value, miss);
 }