[wasm] Fix partial deserialization for lazy compilation

The function index encoded into the serialized module is already offset
by num_imported_functions. For lazy compilation, however, we added the
number of imported functions another time, which was incorrect.

R=clemensb@chromium.org

Change-Id: I56380e21e74b4d1935ebdbab6ef8cc388de49f2c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3172761
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76965}

src/wasm/module-compiler.cc

@@ -3046,13 +3046,13 @@ void CompilationStateImpl::InitializeCompilationProgressAfterDeserialization(
     }
     compilation_progress_.assign(module->num_declared_functions,
                                  kProgressAfterDeserialization);
-    uint32_t num_imported_functions = module->num_imported_functions;
     for (auto func_index : missing_functions) {
       if (FLAG_wasm_lazy_compilation) {
-        native_module_->UseLazyStub(num_imported_functions + func_index);
+        native_module_->UseLazyStub(func_index);
       }
-      compilation_progress_[func_index] = SetupCompilationProgressForFunction(
-          lazy_module, module, enabled_features, func_index);
+      compilation_progress_[declared_function_index(module, func_index)] =
+          SetupCompilationProgressForFunction(lazy_module, module,
+                                              enabled_features, func_index);
     }
   }
   auto builder = std::make_unique<CompilationUnitBuilder>(native_module_);

test/mjsunit/wasm/test-serialization-with-lazy-compilation.js

@@ -10,6 +10,7 @@ const num_functions = 2;
 
 function create_builder() {
   const builder = new WasmModuleBuilder();
+  builder.addImport("foo", "bar", kSig_i_v);
   for (let i = 0; i < num_functions; ++i) {
     builder.addFunction('f' + i, kSig_i_v)
         .addBody(wasmI32Const(i))
@@ -37,7 +38,7 @@ gc();
   print(arguments.callee.name);
   const module = %DeserializeWasmModule(serialized_module, wire_bytes);
 
-  const instance = new WebAssembly.Instance(module);
+  const instance = new WebAssembly.Instance(module, {foo: {bar: () => 1}});
   assertEquals(0, instance.exports.f0());
   assertEquals(1, instance.exports.f1());
 })();