[wasm] Fix receiver conversion for WASM->JS calls.

src/compiler/wasm-compiler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/wasm-compiler.h"
 
 #include "src/isolate-inl.h"
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/base/platform/platform.h"
@@ skipping 2587 matching lines @@
     desc = Linkage::GetStubCallDescriptor(isolate, graph()->zone(),
                                           callable.descriptor(), wasm_count + 1,
                                           CallDescriptor::kNoFlags);
     arg_count_before_args = true;
   }
 
   args[pos++] = jsgraph()->Constant(function);  // JS function.
   if (arg_count_before_args) {
     args[pos++] = jsgraph()->Int32Constant(wasm_count);  // argument count
   }
-  // JS receiver.
-  Handle<Object> global(function->context()->global_object(), isolate);
-  args[pos++] = jsgraph()->Constant(global);
+  // Create the receiver constant (either undefined or the global proxy).
+  Handle<Object> receiver(isolate->heap()->undefined_value(), isolate);
+  if (is_sloppy(function->shared()->language_mode())) {
+    receiver = Handle<Object>(function->context()->global_proxy(), isolate);
+  }
+  args[pos++] = jsgraph()->Constant(receiver);
 
   // Convert WASM numbers to JS values.
   int param_index = 0;
   for (int i = 0; i < wasm_count; ++i) {
     Node* param =
         graph()->NewNode(jsgraph()->common()->Parameter(param_index++), start);
     args[pos++] = ToJS(param, context, sig->GetParam(i));
     if (jsgraph()->machine()->Is32() && sig->GetParam(i) == wasm::kAstI64) {
       // On 32 bit platforms we have to skip the high word of int64 parameters.
       param_index++;
@@ skipping 838 matching lines @@
                             function_->code_start_offset),
            compile_ms);
   }
 
   return code;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8