Revert r13901 to reland with proper credit to external contributor.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index f5ae6119bd7b77d0c452a92c3c2eb55b83bccb3c..0fee67a9bd89a116529c812660183eda7a7968d6 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -316,9 +316,6 @@ class RelocInfo BASE_EMBEDDED {
   static inline bool IsEmbeddedObject(Mode mode) {
     return mode == EMBEDDED_OBJECT;
   }
-  static inline bool IsRuntimeEntry(Mode mode) {
-    return mode == RUNTIME_ENTRY;
-  }
   // Is the relocation mode affected by GC?
   static inline bool IsGCRelocMode(Mode mode) {
     return mode <= LAST_GCED_ENUM;
@@ -382,10 +379,6 @@ class RelocInfo BASE_EMBEDDED {
   INLINE(Object** target_object_address());
   INLINE(void set_target_object(Object* target,
                                 WriteBarrierMode mode = UPDATE_WRITE_BARRIER));
-  INLINE(Address target_runtime_entry(Assembler* origin));
-  INLINE(void set_target_runtime_entry(Address target,
-                                       WriteBarrierMode mode =
-                                           UPDATE_WRITE_BARRIER));
   INLINE(JSGlobalPropertyCell* target_cell());
   INLINE(Handle<JSGlobalPropertyCell> target_cell_handle());
   INLINE(void set_target_cell(JSGlobalPropertyCell* cell,