[macro-assembler] Delete unused MacroAssembler::LoadRootIndexed

Bug: 
Change-Id: Ia2b60b712c6b5d78db1ea15161da2e10282c7d87
Reviewed-on: https://chromium-review.googlesource.com/707061Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48371}

src/x64/macro-assembler-x64.cc

@@ -165,17 +165,6 @@ void TurboAssembler::LoadRoot(Register destination, Heap::RootListIndex index) {
                             (index << kPointerSizeLog2) - kRootRegisterBias));
 }
 
-void MacroAssembler::LoadRootIndexed(Register destination,
-                                     Register variable_offset,
-                                     int fixed_offset) {
-  DCHECK(root_array_available_);
-  movp(destination,
-       Operand(kRootRegister,
-               variable_offset, times_pointer_size,
-               (fixed_offset << kPointerSizeLog2) - kRootRegisterBias));
-}
-
-
 void MacroAssembler::PushRoot(Heap::RootListIndex index) {
   DCHECK(root_array_available_);
   Push(Operand(kRootRegister, (index << kPointerSizeLog2) - kRootRegisterBias));

src/x64/macro-assembler-x64.h

@@ -508,9 +508,6 @@ class MacroAssembler : public TurboAssembler {
   // Load a root value where the index (or part of it) is variable.
   // The variable_offset register is added to the fixed_offset value
   // to get the index into the root-array.
-  void LoadRootIndexed(Register destination,
-                       Register variable_offset,
-                       int fixed_offset);
   void PushRoot(Heap::RootListIndex index);
 
   // Compare the object in a register to a value and jump if they are equal.