[wasm] Fix -Wsign-compare warnings.

test/unittests/wasm/leb-helper-unittest.cc

 // Copyright 2016 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 "test/unittests/test-utils.h"
 
 #include "src/objects-inl.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/leb-helper.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
 class LEBHelperTest : public TestWithZone {};
 
 TEST_F(LEBHelperTest, sizeof_u32v) {
   EXPECT_EQ(1, LEBHelper::sizeof_u32v(0));
   EXPECT_EQ(1, LEBHelper::sizeof_u32v(1));
   EXPECT_EQ(1, LEBHelper::sizeof_u32v(3));
 
   for (uint32_t i = 4; i < 128; i++) {
     EXPECT_EQ(1, LEBHelper::sizeof_u32v(i));
   }
 
-  for (uint32_t i = (1 << 7); i < (1 << 9); i++) {
+  for (uint32_t i = (1u << 7); i < (1u << 9); i++) {
     EXPECT_EQ(2, LEBHelper::sizeof_u32v(i));
   }
 
-  for (uint32_t i = (1 << 14); i < (1 << 16); i += 33) {
+  for (uint32_t i = (1u << 14); i < (1u << 16); i += 33) {
     EXPECT_EQ(3, LEBHelper::sizeof_u32v(i));
   }
 
-  for (uint32_t i = (1 << 21); i < (1 << 24); i += 33999) {
+  for (uint32_t i = (1u << 21); i < (1u << 24); i += 33999) {
     EXPECT_EQ(4, LEBHelper::sizeof_u32v(i));
   }
 
-  for (uint32_t i = (1 << 28); i < (1 << 31); i += 33997779) {
+  for (uint32_t i = (1u << 28); i < (1u << 31); i += 33997779u) {
     EXPECT_EQ(5, LEBHelper::sizeof_u32v(i));
   }
 
   EXPECT_EQ(5, LEBHelper::sizeof_u32v(0xFFFFFFFF));
 }
 
 TEST_F(LEBHelperTest, sizeof_i32v) {
   EXPECT_EQ(1, LEBHelper::sizeof_i32v(0));
   EXPECT_EQ(1, LEBHelper::sizeof_i32v(1));
   EXPECT_EQ(1, LEBHelper::sizeof_i32v(3));
@@ skipping 133 matching lines @@
     CheckEncodeDecode_i64v(bit_cast<int64_t>(val));
   }
 
   for (uint64_t val = 0xFFFFFFFFFFFFFF3B; val != 0; val = val << 1) {
     CheckEncodeDecode_i64v(bit_cast<int64_t>(val));
   }
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8