Revise C++ coding style using clang-format

Run the `Utilities/Scripts/clang-format.bash` script to update
all our C++ code to a new style defined by `.clang-format`.
Use `clang-format` version 3.8.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Tests/CompileFeatures/cxx_inline_namespaces.cpp

@@ -1,26 +1,25 @@
-namespace Lib
-{
-inline namespace Lib_1
-{
-  template <typename T> class A;
+namespace Lib {
+inline namespace Lib_1 {
+template <typename T>
+class A;
 }
 
-template <typename T> void g(T);
+template <typename T>
+void g(T);
 }
 
-struct MyClass {
-
+struct MyClass
+{
 };
-namespace Lib
+namespace Lib {
+template <>
+class A<MyClass>
 {
-template<>
-class A<MyClass> {
-
 };
 }
 
 void someFunc()
 {
   Lib::A<MyClass> a;
-  g(a);  // ok, Lib is an associated namespace of A
+  g(a); // ok, Lib is an associated namespace of A
 }