[turbofan] Fix -Wsign-compare warnings.

test/cctest/asmjs/test-asm-typer.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 <cstring>
 #include <functional>
 #include <iostream>
 #include <memory>
 
 #include "src/asmjs/asm-typer.h"
@@ skipping 1105 matching lines @@
       {"ulocal"},
       {"dqlocal"},
       {"fishlocal"},
   };
 
   char full_test[200];
   static const size_t kFullTestSize = arraysize(full_test);
   for (size_t ii = 0; ii < arraysize(kTests); ++ii) {
     const auto* test = kTests + ii;
     CHECK(v8::base::OS::SNPrintF(full_test, kFullTestSize, "fround(%s)",
-                                 test->expression) < kFullTestSize);
+                                 test->expression) <
+          static_cast<int>(kFullTestSize));
     if (!ValidationOf(Expression(full_test))
              ->WithImport(DynamicGlobal("fround"), iw::AsmTyper::kMathFround)
              ->WithGlobal(DynamicGlobal("a_float_function"), v2f)
              ->WithLocal(DynamicGlobal("slocal"), iw::AsmType::Signed())
              ->WithLocal(DynamicGlobal("ulocal"), iw::AsmType::Unsigned())
              ->WithLocal(DynamicGlobal("dqlocal"), iw::AsmType::DoubleQ())
              ->WithLocal(DynamicGlobal("fishlocal"), iw::AsmType::Floatish())
              ->SucceedsWithExactType(iw::AsmType::Float())) {
       std::cerr << "Test:\n" << full_test;
       CHECK(false);
@@ skipping 10 matching lines @@
   };
 
   auto v2d = [](Zone* zone) -> iw::AsmType* {
     auto* ret = iw::AsmType::Function(zone, iw::AsmType::Double());
     return ret;
   };
 
   for (size_t ii = 0; ii < arraysize(kFailureTests); ++ii) {
     const auto* test = kFailureTests + ii;
     CHECK(v8::base::OS::SNPrintF(full_test, kFullTestSize, "fround(%s)",
-                                 test->expression) < kFullTestSize);
+                                 test->expression) <
+          static_cast<int>(kFullTestSize));
     if (!ValidationOf(Expression(full_test))
              ->WithImport(DynamicGlobal("fround"), iw::AsmTyper::kMathFround)
              ->WithLocal(DynamicGlobal("ilocal"), iw::AsmType::Int())
              ->WithLocal(DynamicGlobal("vlocal"), iw::AsmType::Void())
              ->WithGlobal(DynamicGlobal("a_double_function"), v2d)
              ->FailsWithMessage(test->error_message)) {
       std::cerr << "Test:\n" << full_test;
       CHECK(false);
     }
   }
@@ skipping 879 matching lines @@
     if (!ValidationOf(Module(kTests[ii]))
              ->FailsWithMessage(
                  "Constant in return must be signed, float, or double.")) {
       std::cerr << "Test:\n" << kTests[ii];
       CHECK(false);
     }
   }
 }
 
 }  // namespace