[wasm] Remove dead {num_imported_functions} field.

R=clemensh@chromium.org
BUG=v8:7509

Change-Id: Ia423e60f67d3ffa8d8c2250dc9d4cdff89b91076
Reviewed-on: https://chromium-review.googlesource.com/948487
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51732}

src/objects-debug.cc

@@ -1460,7 +1460,6 @@ void WasmCompiledModule::WasmCompiledModuleVerify() {
   VerifyObjectField(knative_moduleOffset);
   VerifyObjectField(klazy_compile_dataOffset);
   VerifyObjectField(kuse_trap_handlerOffset);
-  VerifyObjectField(knum_imported_functionsOffset);
   VerifyObjectField(kcode_tableOffset);
   VerifyObjectField(kfunction_tablesOffset);
   VerifyObjectField(kempty_function_tablesOffset);

src/wasm/wasm-objects.cc

@@ -1363,12 +1363,6 @@ Handle<WasmCompiledModule> WasmCompiledModule::New(
     compiled_module->InitId();
     compiled_module->set_code_table(*code_table);
     compiled_module->set_export_wrappers(*export_wrappers);
-    // TODO(mtrofin): we copy these because the order of finalization isn't
-    // reliable, and we need these at Reset (which is called at
-    // finalization). If the order were reliable, and top-down, we could instead
-    // just get them from shared().
-    compiled_module->set_num_imported_functions(module->num_imported_functions);
-
     int num_function_tables = static_cast<int>(function_tables.size());
     if (num_function_tables > 0) {
       Handle<FixedArray> ft =
@@ -1439,9 +1433,6 @@ Handle<WasmCompiledModule> WasmCompiledModule::Clone(
     ret->set_lazy_compile_data(module->lazy_compile_data());
   }
   ret->set_use_trap_handler(module->use_trap_handler());
-  if (!FLAG_wasm_jit_to_native) {
-    ret->set_num_imported_functions(module->num_imported_functions());
-  }
   ret->set_code_table(module->code_table());
   if (module->has_function_tables()) {
     ret->set_function_tables(module->function_tables());

src/wasm/wasm-objects.h

@@ -443,7 +443,6 @@ class WasmCompiledModule : public Struct {
   V(knative_moduleOffset, kPointerSize)           \
   V(klazy_compile_dataOffset, kPointerSize)       \
   V(kuse_trap_handlerOffset, kPointerSize)        \
-  V(knum_imported_functionsOffset, kPointerSize)  \
   V(kcode_tableOffset, kPointerSize)              \
   V(kfunction_tablesOffset, kPointerSize)         \
   V(kempty_function_tablesOffset, kPointerSize)   \
@@ -500,7 +499,6 @@ class WasmCompiledModule : public Struct {
   MACRO(OBJECT, FixedArray, lazy_compile_data)                \
   /* TODO(mstarzinger): Make {use_trap_handler} smaller. */   \
   MACRO(SMALL_CONST_NUMBER, bool, use_trap_handler)           \
-  MACRO(SMALL_CONST_NUMBER, uint32_t, num_imported_functions) \
   MACRO(CONST_OBJECT, FixedArray, code_table)                 \
   MACRO(OBJECT, FixedArray, function_tables)                  \
   MACRO(CONST_OBJECT, FixedArray, empty_function_tables)