[Interpreter] Adds support for wide variant of load/store lookup slots.

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index 4ec2d1264b30f9b04e3c5a7ab40d44d42ca12819..52e0cc4e61b5035996dcd0adb83af9e61fcf4347 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -452,6 +452,9 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::LoadLookupSlot(
   size_t name_index = GetConstantPoolEntry(name);
   if (FitsInIdx8Operand(name_index)) {
     Output(bytecode, static_cast<uint8_t>(name_index));
+  } else if (FitsInIdx16Operand(name_index)) {
+    Output(BytecodeForWideOperands(bytecode),
+           static_cast<uint16_t>(name_index));
   } else {
     UNIMPLEMENTED();
   }
@@ -465,6 +468,9 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::StoreLookupSlot(
   size_t name_index = GetConstantPoolEntry(name);
   if (FitsInIdx8Operand(name_index)) {
     Output(bytecode, static_cast<uint8_t>(name_index));
+  } else if (FitsInIdx16Operand(name_index)) {
+    Output(BytecodeForWideOperands(bytecode),
+           static_cast<uint16_t>(name_index));
   } else {
     UNIMPLEMENTED();
   }
@@ -1295,6 +1301,14 @@ Bytecode BytecodeArrayBuilder::BytecodeForWideOperands(Bytecode bytecode) {
       return Bytecode::kStaGlobalSloppyWide;
     case Bytecode::kStaGlobalStrict:
       return Bytecode::kStaGlobalStrictWide;
+    case Bytecode::kLdaLookupSlot:
+      return Bytecode::kLdaLookupSlotWide;
+    case Bytecode::kLdaLookupSlotInsideTypeof:
+      return Bytecode::kLdaLookupSlotInsideTypeofWide;
+    case Bytecode::kStaLookupSlotStrict:
+      return Bytecode::kStaLookupSlotStrictWide;
+    case Bytecode::kStaLookupSlotSloppy:
+      return Bytecode::kStaLookupSlotSloppyWide;
     default:
       UNREACHABLE();
       return static_cast<Bytecode>(-1);