message: Fixed xla_builder_test: AddFrontendAttribute -> SetInstructionFrontendAttribute
  Summary: Fix for build error introduced by
  Test Plan: INFO: Executed 502 out of 536 tests: 536 tests pass.
  Reviewers: #tensorflow, davidn
diff: @@ -1068,7 +1068,7 @@ TEST_F(XlaBuilderTest, ComplexSetFrontendAttributes) {
  ExpectInstructionsAttributesMatch(*module, expected);
  }
  -TEST_F(XlaBuilderTest, AddFrontendAttribute) {
  +TEST_F(XlaBuilderTest, SetInstructionFrontendAttribute) {
  XlaBuilder b(TestName());
  ConstantR0(&b, 0);
  @@ -1086,7 +1086,7 @@ TEST_F(XlaBuilderTest, AddFrontendAttribute) {
  // Two attributes: {"attra": "a", "attr_c": "c"}
  {
  auto op = ConstantR0(&b, 0);
  - EXPECT_IS_OK(b.AddFrontendAttribute(op, "attr_c", "c"));
  + EXPECT_IS_OK(b.SetInstructionFrontendAttribute(op, "attr_c", "c"));
  FrontendAttributes attributes;
  (*attributes.mutable_map())["attr_a"] = "a";
  @@ -1098,7 +1098,7 @@ TEST_F(XlaBuilderTest, AddFrontendAttribute) {
  // One attribute: { "attr_a", "a2"}
  {
  auto op = ConstantR0(&b, 0);
  - EXPECT_IS_OK(b.AddFrontendAttribute(op, "attr_a", "a2"));
  + EXPECT_IS_OK(b.SetInstructionFrontendAttribute(op, "attr_a", "a2"));
  FrontendAttributes attributes;
  (*attributes.mutable_map())["attr_a"] = "a2";
  expected.push_back(attributes);
  @@ -1120,7 +1120,7 @@ TEST_F(XlaBuilderTest, AddFrontendAttribute) {
  // One attribute: { "attr_d", "d"}
  {
  auto op = ConstantR0(&b, 0);
  - EXPECT_IS_OK(b.AddFrontendAttribute(op, "attr_d", "d"));
  + EXPECT_IS_OK(b.SetInstructionFrontendAttribute(op, "attr_d", "d"));
  FrontendAttributes attributes;
  (*attributes.mutable_map())["attr_d"] = "d";
  expected.push_back(attributes);
  