Let clang-format remove empty lines before "}".

These lines almost never aid readability.

Before:
void f() {
  int i;  // some variable

}

After:
void f() {
  int i;  // some variable
}

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183112 91177308-0d34-0410-b5e6-96231b3b80d8