[intrinsics] Nuke %HasCachedArrayIndex and %GetCachedArrayIndex.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 71cd3ec18eb4550b30834addae50d10ac29f6c1e..c66a539208af1c9447e7712daf5ad1af7eac7aeb 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1415,12 +1415,6 @@ class MacroAssembler: public Assembler {
   // clobbered.
   void TryGetFunctionPrototype(Register function, Register result, Label* miss);
 
-  // Picks out an array index from the hash field.
-  // Register use:
-  //   hash - holds the index's hash. Clobbered.
-  //   index - holds the overwritten index on exit.
-  void IndexFromHash(Register hash, Register index);
-
   // Find the function context up the context chain.
   void LoadContext(Register dst, int context_chain_length);