[wasm] Fix more -Wsign-compare warnings.

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/base/bits.h"
 #include "src/wasm/wasm-macro-gen.h"
@@ skipping 282 matching lines @@
       }
     }
   }
 }
 
 WASM_EXEC_TEST(I64DivU_Trap) {
   REQUIRE(I64DivU);
   WasmRunner<uint64_t> r(execution_mode, MachineType::Uint64(),
                          MachineType::Uint64());
   BUILD(r, WASM_I64_DIVU(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
-  CHECK_EQ(0, r.Call(asu64(0), asu64(100)));
+  CHECK_EQ(0u, r.Call(asu64(0), asu64(100)));
   CHECK_TRAP64(r.Call(asu64(100), asu64(0)));
   CHECK_TRAP64(r.Call(asu64(1001), asu64(0)));
   CHECK_TRAP64(r.Call(std::numeric_limits<uint64_t>::max(), asu64(0)));
 }
 
 WASM_EXEC_TEST(I64DivU_Byzero_Const) {
   REQUIRE(I64DivU);
   for (uint64_t denom = 0xfffffffffffffffe; denom < 8; denom++) {
     WasmRunner<uint64_t> r(execution_mode, MachineType::Uint64());
     BUILD(r, WASM_I64_DIVU(WASM_GET_LOCAL(0), WASM_I64V_1(denom)));
@@ skipping 50 matching lines @@
       }
     }
   }
 }
 
 WASM_EXEC_TEST(I64RemU_Trap) {
   REQUIRE(I64RemU);
   WasmRunner<uint64_t> r(execution_mode, MachineType::Uint64(),
                          MachineType::Uint64());
   BUILD(r, WASM_I64_REMU(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
-  CHECK_EQ(17, r.Call(asu64(217), asu64(100)));
+  CHECK_EQ(17u, r.Call(asu64(217), asu64(100)));
   CHECK_TRAP64(r.Call(asu64(100), asu64(0)));
   CHECK_TRAP64(r.Call(asu64(1001), asu64(0)));
   CHECK_TRAP64(r.Call(std::numeric_limits<uint64_t>::max(), asu64(0)));
 }
 
 WASM_EXEC_TEST(I64And) {
   REQUIRE(I64And);
   WasmRunner<int64_t> r(execution_mode, MachineType::Int64(),
                         MachineType::Int64());
   BUILD(r, WASM_I64_AND(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
@@ skipping 1269 matching lines @@
         CHECK_EQ(expected, result);
       }
     }
   }
 }
 
 WASM_EXEC_TEST(MixedCall_i64_0) { Run_WasmMixedCall_N(execution_mode, 0); }
 WASM_EXEC_TEST(MixedCall_i64_1) { Run_WasmMixedCall_N(execution_mode, 1); }
 WASM_EXEC_TEST(MixedCall_i64_2) { Run_WasmMixedCall_N(execution_mode, 2); }
 WASM_EXEC_TEST(MixedCall_i64_3) { Run_WasmMixedCall_N(execution_mode, 3); }