[compiler] Allow for StackSlots of arbitrary size

src/compiler/instruction-selector.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/compiler-source-position-table.h"
@@ skipping 1614 matching lines @@
   for (size_t index = 0; index < sw.case_count; ++index) {
     int32_t value = sw.case_values[index];
     BasicBlock* branch = sw.case_branches[index];
     inputs[index * 2 + 2 + 0] = g.TempImmediate(value);
     inputs[index * 2 + 2 + 1] = g.Label(branch);
   }
   Emit(kArchLookupSwitch, 0, nullptr, input_count, inputs, 0, nullptr);
 }
 
 void InstructionSelector::VisitStackSlot(Node* node) {
-  int size = 1 << ElementSizeLog2Of(StackSlotRepresentationOf(node->op()));
+  int size = StackSlotSizeOf(node->op());
   int slot = frame_->AllocateSpillSlot(size);
   OperandGenerator g(this);
 
   Emit(kArchStackSlot, g.DefineAsRegister(node),
        sequence()->AddImmediate(Constant(slot)), 0, nullptr);
 }
 
 void InstructionSelector::VisitBitcastTaggedToWord(Node* node) {
   EmitIdentity(node);
 }
@@ skipping 615 matching lines @@
   return new (instruction_zone()) FrameStateDescriptor(
       instruction_zone(), state_info.type(), state_info.bailout_id(),
       state_info.state_combine(), parameters, locals, stack,
       state_info.shared_info(), outer_state);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8