Add .clang-format and run clang-format on runtime/platform.

runtime/platform/utils.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/utils.h"
 
 namespace dart {
 
 // Implementation is from "Hacker's Delight" by Henry S. Warren, Jr.,
 // figure 3-3, page 48, where the function is called clp2.
@@ skipping 21 matching lines @@
   x = x + (x >> 16);
   return static_cast<int>(x & 0x0000003F);
 }
 
 
 // TODO(koda): Compare to flsll call/intrinsic.
 int Utils::HighestBit(int64_t v) {
   uint64_t x = static_cast<uint64_t>((v > 0) ? v : -v);
   uint64_t t;
   int r = 0;
-  if ((t = x >> 32) != 0) { x = t; r += 32; }
-  if ((t = x >> 16) != 0) { x = t; r += 16; }
-  if ((t = x >> 8) != 0) { x = t; r += 8; }
-  if ((t = x >> 4) != 0) { x = t; r += 4; }
-  if ((t = x >> 2) != 0) { x = t; r += 2; }
+  if ((t = x >> 32) != 0) {
+    x = t;
+    r += 32;
+  }
+  if ((t = x >> 16) != 0) {
+    x = t;
+    r += 16;
+  }
+  if ((t = x >> 8) != 0) {
+    x = t;
+    r += 8;
+  }
+  if ((t = x >> 4) != 0) {
+    x = t;
+    r += 4;
+  }
+  if ((t = x >> 2) != 0) {
+    x = t;
+    r += 2;
+  }
   if (x > 1) r += 1;
   return r;
 }
 
 
 uint32_t Utils::StringHash(const char* data, int length) {
   // This implementation is based on the public domain MurmurHash
   // version 2.0. It assumes that the underlying CPU can read from
   // unaligned addresses. The constants M and R have been determined
   // to work well experimentally.
@@ skipping 44 matching lines @@
   a = (a ^ 0xc761c23c) ^ (a >> 19);
   a = (a + 0x165667b1) + (a << 5);
   a = (a + 0xd3a2646c) ^ (a << 9);
   a = (a + 0xfd7046c5) + (a << 3);
   a = (a ^ 0xb55a4f09) ^ (a >> 16);
   return static_cast<uint32_t>(a);
 }
 
 
 }  // namespace dart