[arm64] Bug fix in sapefoint recording.

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index a285e7bcc1529419639093e5f204e3ee17abda1e..1b8ae1b9c145f90fe36fc319cf980d54cf073f93 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -557,11 +557,6 @@ void LCodeGen::RecordSafepoint(LPointerMap* pointers,
       safepoint.DefinePointerRegister(ToRegister(pointer), zone());
     }
   }
-
-  if (kind & Safepoint::kWithRegisters) {
-    // Register cp always contains a pointer to the context.
-    safepoint.DefinePointerRegister(cp, zone());
-  }
 }
 
 void LCodeGen::RecordSafepoint(LPointerMap* pointers,