[wasm] remove faux code objects

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index 553e37da40e125c0c22f4d7de5eac3aacf44e5d4..67f30f20a09e7bf777474ada4ac56cea59bb23a1 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -415,6 +415,10 @@ void RelocInfoWriter::WriteMode(RelocInfo::Mode rmode) {
   *--pos_ = static_cast<int>((rmode << kTagBits) | kDefaultTag);
 }
 
+void RelocInfoWriter::WriteModeNoAdvance(RelocInfo::Mode rmode) {
+  STATIC_ASSERT(RelocInfo::NUMBER_OF_MODES <= (1 << kLongTagBits));
+  *pos_ = static_cast<int>((rmode << kTagBits) | kDefaultTag);
+}
 
 void RelocInfoWriter::WriteModeAndPC(uint32_t pc_delta, RelocInfo::Mode rmode) {
   // Write two-byte tagged pc-delta, possibly preceded by var. length pc-jump.
@@ -548,6 +552,7 @@ inline int RelocIterator::AdvanceGetTag() {
 
 
 inline RelocInfo::Mode RelocIterator::GetMode() {
+  mode_pos_ = pos_;
   return static_cast<RelocInfo::Mode>((*pos_ >> kTagBits) &
                                       ((1 << kLongTagBits) - 1));
 }
@@ -754,6 +759,7 @@ RelocIterator::RelocIterator(Code* code, int mode_mask)
   rinfo_.data_ = 0;
   // Relocation info is read backwards.
   pos_ = code->relocation_start() + code->relocation_size();
+  mode_pos_ = nullptr;
   end_ = code->relocation_start();
   done_ = false;
   mode_mask_ = mode_mask;
@@ -779,6 +785,7 @@ RelocIterator::RelocIterator(const CodeDesc& desc, int mode_mask)
   rinfo_.data_ = 0;
   // Relocation info is read backwards.
   pos_ = desc.buffer + desc.buffer_size;
+  mode_pos_ = nullptr;
   end_ = pos_ - desc.reloc_size;
   done_ = false;
   mode_mask_ = mode_mask;
@@ -867,6 +874,10 @@ const char* RelocInfo::RelocModeName(RelocInfo::Mode rmode) {
       return "wasm memory reference";
     case WASM_MEMORY_SIZE_REFERENCE:
       return "wasm memory size reference";
+    case WASM_DIRECT_CALL:
+      return "wasm direct call";
+    case WASM_IMPORT_CALL:
+      return "wasm import call";
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
@@ -966,6 +977,8 @@ void RelocInfo::Verify(Isolate* isolate) {
     case WASM_MEMORY_SIZE_REFERENCE:
     case NONE32:
     case NONE64:
+    case WASM_DIRECT_CALL:
+    case WASM_IMPORT_CALL:
       break;
     case NUMBER_OF_MODES:
     case PC_JUMP: