MIPS: Check that address given to __ RecordWrite is correct.

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 cdacbf3c0d86cb588e0bfafbfd8392f017f447f4..78890ef91a764a6e00a6d8fc3d3c57f4a8fa25b9 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -252,6 +252,12 @@ void MacroAssembler::RecordWrite(Register object,
   // registers are cp.
   ASSERT(!address.is(cp) && !value.is(cp));
 
+  if (FLAG_debug_code) {
+    lw(at, MemOperand(address));
+    Assert(eq, "Wrong address or value passed to RecordWrite",
+        at, Operand(value));
+  }
+
   Label done;
 
   if (smi_check == INLINE_SMI_CHECK) {