Revert r13901 to reland with proper credit to external contributor.

src/arm/assembler-arm-inl.h

Index: src/arm/assembler-arm-inl.h
diff --git a/src/arm/assembler-arm-inl.h b/src/arm/assembler-arm-inl.h
index 85a523d39c71d7e5c275e2950ccb7253e45c45a7..af29bb8cf0a010ee4f2b3ce8122972f708e19f66 100644
--- a/src/arm/assembler-arm-inl.h
+++ b/src/arm/assembler-arm-inl.h
@@ -178,19 +178,6 @@ Address* RelocInfo::target_reference_address() {
 }
 
 
-Address RelocInfo::target_runtime_entry(Assembler* origin) {
-  ASSERT(IsRuntimeEntry(rmode_));
-  return target_address();
-}
-
-
-void RelocInfo::set_target_runtime_entry(Address target,
-                                         WriteBarrierMode mode) {
-  ASSERT(IsRuntimeEntry(rmode_));
-  if (target_address() != target) set_target_address(target, mode);
-}
-
-
 Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() {
   ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
   Address address = Memory::Address_at(pc_);