[wasm] Mask shift counts on architectures that don't implicitly mask.

test/cctest/wasm/test-run-wasm-64.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 <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/wasm/wasm-macro-gen.h"
 
@@ skipping 1299 matching lines @@
   REQUIRE(I64Eq);
 
   WasmRunner<int32_t> r(MachineType::Int64());
   BUILD(r, WASM_I64_EQZ(WASM_GET_LOCAL(0)));
 
   FOR_INT64_INPUTS(i) {
     int32_t result = *i == 0 ? 1 : 0;
     CHECK_EQ(result, r.Call(*i));
   }
 }
+
+TEST(Run_WasmI64Shl) {
+  REQUIRE(I64Shl);
+  WasmRunner<uint64_t> r(MachineType::Uint64(), MachineType::Uint64());
+  BUILD(r, WASM_I64_SHL(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
+
+  FOR_UINT64_INPUTS(i) {
+    FOR_UINT64_INPUTS(j) {
+      uint64_t expected = (*i) << (*j & 0x3f);
+      CHECK_EQ(expected, r.Call(*i, *j));
+    }
+  }
+}
+
+TEST(Run_WasmI64Shr) {
+  REQUIRE(I64ShrU);
+  WasmRunner<uint64_t> r(MachineType::Uint64(), MachineType::Uint64());
+  BUILD(r, WASM_I64_SHR(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
+
+  FOR_UINT64_INPUTS(i) {
+    FOR_UINT64_INPUTS(j) {
+      uint64_t expected = (*i) >> (*j & 0x3f);
+      CHECK_EQ(expected, r.Call(*i, *j));
+    }
+  }
+}
+
+TEST(Run_WasmI64Sar) {
+  REQUIRE(I64ShrS);
+  WasmRunner<int64_t> r(MachineType::Int64(), MachineType::Int64());
+  BUILD(r, WASM_I64_SAR(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
+
+  FOR_INT64_INPUTS(i) {
+    FOR_INT64_INPUTS(j) {
+      int64_t expected = (*i) >> (*j & 0x3f);
+      CHECK_EQ(expected, r.Call(*i, *j));
+    }
+  }
+}