[objects] Remove unused {Code::protected_instructions} field.

R=clemensh@chromium.org
BUG=v8:7549

Change-Id: I6c888fb2610ef76d488e17576773f47a7358d0d9
Reviewed-on: https://chromium-review.googlesource.com/957729Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51888}

src/heap/heap.cc

@@ -3286,7 +3286,6 @@ AllocationResult Heap::AllocateCode(
   code->set_deoptimization_data(deopt_data);
   code->set_stub_key(stub_key);
   code->set_source_position_table(source_position_table);
-  code->set_protected_instructions(empty_fixed_array(), SKIP_WRITE_BARRIER);
   code->set_constant_pool_offset(desc.instr_size - desc.constant_pool_size);
   code->set_builtin_index(builtin_index);
   code->set_trap_handler_index(Smi::FromInt(-1));

src/objects-body-descriptors-inl.h

@@ -398,8 +398,6 @@ class Code::BodyDescriptor final : public BodyDescriptorBase {
   STATIC_ASSERT(kDeoptimizationDataOffset + kPointerSize ==
                 kSourcePositionTableOffset);
   STATIC_ASSERT(kSourcePositionTableOffset + kPointerSize ==
-                kProtectedInstructionsOffset);
-  STATIC_ASSERT(kProtectedInstructionsOffset + kPointerSize ==
                 kCodeDataContainerOffset);
   STATIC_ASSERT(kCodeDataContainerOffset + kPointerSize == kDataStart);
 

src/objects/code-inl.h

@@ -182,7 +182,6 @@ INT_ACCESSORS(Code, constant_pool_offset, kConstantPoolOffset)
 CODE_ACCESSORS(relocation_info, ByteArray, kRelocationInfoOffset)
 CODE_ACCESSORS(deoptimization_data, FixedArray, kDeoptimizationDataOffset)
 CODE_ACCESSORS(source_position_table, Object, kSourcePositionTableOffset)
-CODE_ACCESSORS(protected_instructions, FixedArray, kProtectedInstructionsOffset)
 CODE_ACCESSORS(code_data_container, CodeDataContainer, kCodeDataContainerOffset)
 CODE_ACCESSORS(trap_handler_index, Smi, kTrapHandlerIndex)
 #undef CODE_ACCESSORS
@@ -191,7 +190,6 @@ void Code::WipeOutHeader() {
   WRITE_FIELD(this, kRelocationInfoOffset, nullptr);
   WRITE_FIELD(this, kDeoptimizationDataOffset, nullptr);
   WRITE_FIELD(this, kSourcePositionTableOffset, nullptr);
-  WRITE_FIELD(this, kProtectedInstructionsOffset, nullptr);
   WRITE_FIELD(this, kCodeDataContainerOffset, nullptr);
 }
 
@@ -297,7 +295,6 @@ int Code::SizeIncludingMetadata() const {
   int size = CodeSize();
   size += relocation_info()->Size();
   size += deoptimization_data()->Size();
-  size += protected_instructions()->Size();
   return size;
 }
 

src/objects/code.h

@@ -80,11 +80,6 @@ class Code : public HeapObject {
   DECL_ACCESSORS(source_position_table, Object)
   inline ByteArray* SourcePositionTable() const;
 
-  // TODO(mstarzinger): remove when we don't need FLAG_wasm_jit_to_native
-  // [protected instructions]: Array containing list of protected
-  // instructions and corresponding landing pad offset.
-  DECL_ACCESSORS(protected_instructions, FixedArray)
-
   // [code_data_container]: A container indirection for all mutable fields.
   DECL_ACCESSORS(code_data_container, CodeDataContainer)
 
@@ -381,10 +376,8 @@ class Code : public HeapObject {
       kRelocationInfoOffset + kPointerSize;
   static const int kSourcePositionTableOffset =
       kDeoptimizationDataOffset + kPointerSize;
-  static const int kProtectedInstructionsOffset =
-      kSourcePositionTableOffset + kPointerSize;
   static const int kCodeDataContainerOffset =
-      kProtectedInstructionsOffset + kPointerSize;
+      kSourcePositionTableOffset + kPointerSize;
   static const int kInstructionSizeOffset =
       kCodeDataContainerOffset + kPointerSize;
   static const int kFlagsOffset = kInstructionSizeOffset + kIntSize;