Fix more -Wsign-compare warnings in heap, mips, base, etc.

test/unittests/heap/slot-set-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 <limits>
 #include <map>
 
 #include "src/globals.h"
 #include "src/heap/slot-set.h"
 #include "src/heap/spaces.h"
@@ skipping 150 matching lines @@
     ++added;
   }
   int iterated = 0;
   set.Iterate(
       [&iterated, kDelta, kHostDelta](SlotType type, Address host_addr,
                                       Address addr) {
         uint32_t i = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(addr));
         uint32_t j =
             static_cast<uint32_t>(reinterpret_cast<uintptr_t>(host_addr));
         EXPECT_EQ(i % CLEARED_SLOT, static_cast<uint32_t>(type));
-        EXPECT_EQ(0, i % kDelta);
-        EXPECT_EQ(0, j % kHostDelta);
+        EXPECT_EQ(0u, i % kDelta);
+        EXPECT_EQ(0u, j % kHostDelta);
         ++iterated;
         return i % 2 == 0 ? KEEP_SLOT : REMOVE_SLOT;
       },
       TypedSlotSet::KEEP_EMPTY_CHUNKS);
   EXPECT_EQ(added, iterated);
   iterated = 0;
   set.Iterate(
       [&iterated](SlotType type, Address host_addr, Address addr) {
         uint32_t i = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(addr));
-        EXPECT_EQ(0, i % 2);
+        EXPECT_EQ(0u, i % 2);
         ++iterated;
         return KEEP_SLOT;
       },
       TypedSlotSet::KEEP_EMPTY_CHUNKS);
   EXPECT_EQ(added / 2, iterated);
 }
 
 TEST(TypedSlotSet, RemoveInvalidSlots) {
   TypedSlotSet set(0);
   const int kHostDelta = 100;
@@ skipping 19 matching lines @@
           CHECK(reinterpret_cast<uintptr_t>(host_addr) < start ||
                 reinterpret_cast<uintptr_t>(host_addr) >= end);
           return KEEP_SLOT;
         },
         TypedSlotSet::KEEP_EMPTY_CHUNKS);
   }
 }
 
 }  // namespace internal
 }  // namespace v8