[wasm] Do not create special wrappers for i64 imports on 32-bit platforms

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 <memory>
 
 #include "src/isolate-inl.h"
 
@@ skipping 2767 matching lines @@
 
     call = graph()->NewNode(jsgraph()->common()->Call(desc), pos, args);
   }
 
   // Convert the return value back.
   Node* ret;
   Node* val =
       FromJS(call, HeapConstant(isolate->native_context()),
              sig->return_count() == 0 ? wasm::kAstStmt : sig->GetReturn());
   Node* pop_size = jsgraph()->Int32Constant(0);
-  if (jsgraph()->machine()->Is32() && sig->return_count() > 0 &&
-      sig->GetReturn() == wasm::kAstI64) {
-    ret = graph()->NewNode(jsgraph()->common()->Return(), pop_size, val,
-                           graph()->NewNode(jsgraph()->machine()->Word32Sar(),
-                                            val, jsgraph()->Int32Constant(31)),
-                           call, start);
-  } else {
     ret = graph()->NewNode(jsgraph()->common()->Return(), pop_size, val, call,
                            start);
-  }
 
   MergeControlToEnd(jsgraph(), ret);
 }
 
 Node* WasmGraphBuilder::MemBuffer(uint32_t offset) {
   DCHECK(module_ && module_->instance);
   if (offset == 0) {
     if (!mem_buffer_) {
       mem_buffer_ = jsgraph()->RelocatableIntPtrConstant(
           reinterpret_cast<uintptr_t>(module_->instance->mem_start),
@@ skipping 688 matching lines @@
                             function_->code_start_offset),
            compile_ms);
   }
 
   return code;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8