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

src/asmjs/asm-wasm-builder.cc

Index: src/asmjs/asm-wasm-builder.cc
diff --git a/src/asmjs/asm-wasm-builder.cc b/src/asmjs/asm-wasm-builder.cc
index 0dfd5e2ade8061d400f782556e419ac4e06f29bd..6419459307be958b5d32e80a6471ec01fb56dc2a 100644
--- a/src/asmjs/asm-wasm-builder.cc
+++ b/src/asmjs/asm-wasm-builder.cc
@@ -830,6 +830,12 @@ class AsmWasmBuilderImpl final : public AstVisitor<AsmWasmBuilderImpl> {
   void VisitAssignment(Assignment* expr) {
     bool as_init = false;
     if (scope_ == kModuleScope) {
+      // Skip extra assignment inserted by the parser when in this form:
+      // (function Module(a, b, c) {... })
+      if (expr->target()->IsVariableProxy() &&
+          expr->target()->AsVariableProxy()->var()->mode() == CONST_LEGACY) {
+        return;
+      }
       Property* prop = expr->value()->AsProperty();
       if (prop != nullptr) {
         VariableProxy* vp = prop->obj()->AsVariableProxy();