MIPS: Let the register allocator handle the context register.

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 cbb538f39d34d8977c978fd08681f5dbce3b31a8..2e113fc9dabc38440843a69e5df527bf667248ce 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -248,10 +248,6 @@ void MacroAssembler::RecordWrite(Register object,
                                  SmiCheck smi_check) {
   ASSERT(!AreAliased(object, address, value, t8));
   ASSERT(!AreAliased(object, address, value, t9));
-  // The compiled code assumes that record write doesn't change the
-  // context register, so we check that none of the clobbered
-  // registers are cp.
-  ASSERT(!address.is(cp) && !value.is(cp));
 
   if (emit_debug_code()) {
     lw(at, MemOperand(address));