[intrinsics] Nuke %HasCachedArrayIndex and %GetCachedArrayIndex.

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index b6adeca56b688afc137ac2a5a5206f6fe897736b..533e705b3bf5ed19ffbe50c3c2ba2295233b647b 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -3776,19 +3776,6 @@ bool MacroAssembler::AllowThisStubCall(CodeStub* stub) {
   return has_frame_ || !stub->SometimesSetsUpAFrame();
 }
 
-
-void MacroAssembler::IndexFromHash(Register hash, Register index) {
-  // If the hash field contains an array index pick it out. The assert checks
-  // that the constants for the maximum number of digits for an array index
-  // cached in the hash field and the number of bits reserved for it does not
-  // conflict.
-  DCHECK(TenToThe(String::kMaxCachedArrayIndexLength) <
-         (1 << String::kArrayIndexValueBits));
-  DecodeField<String::ArrayIndexValueBits>(index, hash);
-  SmiTag(index, index);
-}
-
-
 void MacroAssembler::EmitSeqStringSetCharCheck(
     Register string,
     Register index,