Fix -Wsign-compare errors in TF tests under GCC 4.9.2

R=jkummerow@chromium.org
LOG=N
BUG=

Review URL: https://codereview.chromium.org/1191433003

Cr-Commit-Position: refs/heads/master@{#29023}

test/unittests/compiler/graph-reducer-unittest.cc

@@ -596,12 +596,12 @@ TEST_F(GraphReducerTest, ReduceNew1) {
 TEST_F(GraphReducerTest, Wrapping1) {
   Node* end = graph()->NewNode(&kOpA0);
   graph()->SetEnd(end);
-  EXPECT_EQ(1, graph()->NodeCount());
+  EXPECT_EQ(1U, graph()->NodeCount());
 
   A0Wrapper r(graph());
 
   ReduceGraph(&r);
-  EXPECT_EQ(2, graph()->NodeCount());
+  EXPECT_EQ(2U, graph()->NodeCount());
 
   Node* nend = graph()->end();
   EXPECT_NE(end, nend);
@@ -614,12 +614,12 @@ TEST_F(GraphReducerTest, Wrapping1) {
 TEST_F(GraphReducerTest, Wrapping2) {
   Node* end = graph()->NewNode(&kOpB0);
   graph()->SetEnd(end);
-  EXPECT_EQ(1, graph()->NodeCount());
+  EXPECT_EQ(1U, graph()->NodeCount());
 
   B0Wrapper r(graph());
 
   ReduceGraph(&r);
-  EXPECT_EQ(3, graph()->NodeCount());
+  EXPECT_EQ(3U, graph()->NodeCount());
 
   Node* nend = graph()->end();
   EXPECT_NE(end, nend);

test/unittests/compiler/node-unittest.cc

@@ -32,7 +32,7 @@ const Operator kOp2(kOpcode2, Operator::kNoProperties, "Op2", 2, 0, 0, 1, 0, 0);
 
 TEST_F(NodeTest, New) {
   Node* const node = Node::New(zone(), 1, &kOp0, 0, nullptr, false);
-  EXPECT_EQ(1, node->id());
+  EXPECT_EQ(1U, node->id());
   EXPECT_EQ(0, node->UseCount());
   EXPECT_TRUE(node->uses().empty());
   EXPECT_EQ(0, node->InputCount());