clang-tidy msl IR packed_vec3 transformation

Fixes g3 clang-tidy complaints for these files.

Change-Id: I0a3e31978d3efa5c1f7873379237fc280173022e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/204674
Commit-Queue: James Price <jrprice@google.com>
Auto-Submit: David Neto <dneto@google.com>
Reviewed-by: James Price <jrprice@google.com>
diff --git a/src/tint/lang/msl/writer/raise/packed_vec3.cc b/src/tint/lang/msl/writer/raise/packed_vec3.cc
index ec339d7..0284f08 100644
--- a/src/tint/lang/msl/writer/raise/packed_vec3.cc
+++ b/src/tint/lang/msl/writer/raise/packed_vec3.cc
@@ -27,10 +27,12 @@
 
 #include "src/tint/lang/msl/writer/raise/packed_vec3.h"
 
+#include <cstdint>
 #include <utility>
 
 #include "src/tint/lang/core/ir/builder.h"
 #include "src/tint/lang/core/ir/validator.h"
+#include "src/tint/lang/core/type/manager.h"
 
 namespace tint::msl::writer::raise {
 namespace {
diff --git a/src/tint/lang/msl/writer/raise/packed_vec3_test.cc b/src/tint/lang/msl/writer/raise/packed_vec3_test.cc
index b890a74..d0a34fc 100644
--- a/src/tint/lang/msl/writer/raise/packed_vec3_test.cc
+++ b/src/tint/lang/msl/writer/raise/packed_vec3_test.cc
@@ -27,11 +27,10 @@
 
 #include "src/tint/lang/msl/writer/raise/packed_vec3.h"
 
-#include <utility>
-
+#include "gtest/gtest.h"
 #include "src/tint/lang/core/fluent_types.h"
 #include "src/tint/lang/core/ir/transform/helper_test.h"
-#include "src/tint/lang/core/type/sampled_texture.h"
+#include "src/tint/lang/core/number.h"
 
 using namespace tint::core::fluent_types;     // NOLINT
 using namespace tint::core::number_suffixes;  // NOLINT