[wasm] asm.js - Remove Wasm.instantiateModuleFromAsm, use asm.js directly.

src/asmjs/asm-typer.cc

Index: src/asmjs/asm-typer.cc
diff --git a/src/asmjs/asm-typer.cc b/src/asmjs/asm-typer.cc
index 01c8caed6e1eb2c0a8988f0c65a4d29d4a125f52..4415c30ac6a32b3c6ea59981e7aaa59d11a8f1bc 100644
--- a/src/asmjs/asm-typer.cc
+++ b/src/asmjs/asm-typer.cc
@@ -597,7 +597,21 @@ AsmType* AsmTyper::ValidateModule(FunctionLiteral* fun) {
   ZoneVector<Assignment*> function_pointer_tables(zone_);
   FlattenedStatements iter(zone_, fun->body());
   auto* use_asm_directive = iter.Next();
-  if (use_asm_directive == nullptr || !IsUseAsmDirective(use_asm_directive)) {
+  if (use_asm_directive == nullptr) {
+    FAIL(fun, "Missing \"use asm\".");
+  }
+  // Check for extra assignment inserted by the parser when in this form:
+  // (function Module(a, b, c) {... })
+  ExpressionStatement* estatement = use_asm_directive->AsExpressionStatement();
+  if (estatement != nullptr) {
+    Assignment* assignment = estatement->expression()->AsAssignment();
+    if (assignment != nullptr && assignment->target()->IsVariableProxy() &&
+        assignment->target()->AsVariableProxy()->var()->mode() ==
+            CONST_LEGACY) {
+      use_asm_directive = iter.Next();
+    }
+  }
+  if (!IsUseAsmDirective(use_asm_directive)) {
     FAIL(fun, "Missing \"use asm\".");
   }
   source_layout.AddUseAsm(*use_asm_directive);