[turbofan] Fix -Wsign-compare warnings.

test/cctest/compiler/test-run-load-store.cc

Index: test/cctest/compiler/test-run-load-store.cc
diff --git a/test/cctest/compiler/test-run-load-store.cc b/test/cctest/compiler/test-run-load-store.cc
index 246112938409742dfbffa8596718dcb77c64d2d5..b4970612a5f45dcd3a02e888d2c0d825f776d42d 100644
--- a/test/cctest/compiler/test-run-load-store.cc
+++ b/test/cctest/compiler/test-run-load-store.cc
@@ -988,12 +988,13 @@ void TestRunOobCheckedLoad_pseudo(uint64_t x, bool length_is_immediate) {
   for (uint32_t i = 0; i < kNumElems; i++) {
     uint32_t offset = static_cast<uint32_t>(i * sizeof(int32_t));
     uint32_t expected = buffer[i];
-    CHECK_EQ(expected, m.Call(offset + pseudo_base, kLength));
+    CHECK_EQ(expected,
+             static_cast<uint32_t>(m.Call(offset + pseudo_base, kLength)));
   }
 
   // slightly out-of-bounds accesses.
-  for (int32_t i = kNumElems; i < kNumElems + 30; i++) {
-    uint32_t offset = static_cast<uint32_t>(i * sizeof(int32_t));
+  for (uint32_t i = kNumElems; i < kNumElems + 30; i++) {
+    uint32_t offset = i * sizeof(int32_t);
     CheckOobValue(m.Call(offset + pseudo_base, kLength));
   }