[wasm] Fix more -Wsign-compare warnings.

test/cctest/wasm/test-run-wasm-relocation.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 <stdlib.h>
 
 #include "src/v8.h"
 
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/c-signature.h"
@@ skipping 13 matching lines @@
     TestingModule module(kExecuteCompiled);                                  \
     module.AddGlobal<C_TYPE>(kAst##MACHINE_TYPE);                            \
     module.AddGlobal<C_TYPE>(kAst##MACHINE_TYPE);                            \
                                                                              \
     WasmRunner<C_TYPE> r(&module,                                            \
                          WasmOpcodes::MachineTypeFor(kAst##MACHINE_TYPE));   \
                                                                              \
     /* global = global + p0 */                                               \
     BUILD(r, WASM_SET_GLOBAL(1, ADD(WASM_GET_GLOBAL(0), WASM_GET_LOCAL(0))), \
           WASM_GET_GLOBAL(0));                                               \
-    CHECK_EQ(1, module.instance->function_code.size());                      \
+    CHECK_EQ(1u, module.instance->function_code.size());                     \
                                                                              \
     int filter = 1 << RelocInfo::WASM_GLOBAL_REFERENCE;                      \
                                                                              \
     Handle<Code> code = module.instance->function_code[0];                   \
                                                                              \
     Address old_start = module.instance->globals_start;                      \
     Address new_start = old_start + 1;                                       \
                                                                              \
     Address old_addresses[4];                                                \
     uint32_t address_index = 0U;                                             \
     for (RelocIterator it(*code, filter); !it.done(); it.next()) {           \
       old_addresses[address_index] = it.rinfo()->wasm_global_reference();    \
       it.rinfo()->update_wasm_global_reference(old_start, new_start);        \
       ++address_index;                                                       \
     }                                                                        \
     CHECK_LE(address_index, 4U);                                             \
                                                                              \
     address_index = 0U;                                                      \
     for (RelocIterator it(*code, filter); !it.done(); it.next()) {           \
       CHECK_EQ(old_addresses[address_index] + 1,                             \
                it.rinfo()->wasm_global_reference());                         \
       ++address_index;                                                       \
     }                                                                        \
     CHECK_LE(address_index, 4U);                                             \
   }
 
 FOREACH_TYPE(LOAD_SET_GLOBAL_TEST_BODY)