Revert r13901 to reland with proper credit to external contributor.

src/mips/assembler-mips-inl.h

Index: src/mips/assembler-mips-inl.h
diff --git a/src/mips/assembler-mips-inl.h b/src/mips/assembler-mips-inl.h
index 1dad8157f83ccfc9bc3e5f6604febd9c91a0ea43..0499d3638956a655a394ffe34fa385c149b1d67a 100644
--- a/src/mips/assembler-mips-inl.h
+++ b/src/mips/assembler-mips-inl.h
@@ -231,19 +231,6 @@ 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_);