[wasm] Fix more -Wsign-compare warnings.

src/wasm/wasm-interpreter.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 "src/wasm/wasm-interpreter.h"
 
 #include "src/utils.h"
 #include "src/wasm/ast-decoder.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-external-refs.h"
@@ skipping 1680 matching lines @@
   void PopN(int n) {
     DCHECK_GE(stack_.size(), static_cast<size_t>(n));
     DCHECK_GT(frames_.size(), 0u);
     size_t nsize = stack_.size() - n;
     DCHECK_GE(nsize, frames_.back().llimit());  // can't pop into locals
     stack_.resize(nsize);
   }
 
   WasmVal PopArity(size_t arity) {
     if (arity == 0) return WasmVal();
-    CHECK_EQ(1, arity);
+    CHECK_EQ(1u, arity);
     return Pop();
   }
 
   void Push(pc_t pc, WasmVal val) {
     // TODO(titzer): store PC as well?
     if (val.type != kAstStmt) stack_.push_back(val);
   }
 
   void TraceStack(const char* phase, pc_t pc) {
     if (FLAG_trace_wasm_interpreter) {
@@ skipping 173 matching lines @@
 
 ControlTransferMap WasmInterpreter::ComputeControlTransfersForTesting(
     Zone* zone, const byte* start, const byte* end) {
   ControlTransfers targets(zone, nullptr, nullptr, start, end);
   return targets.map_;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8