clang-format: tweak configuration

Update the configuration to reflect the style more accurately.  Pointers
are tied to the left.  Braces are split on classes/structs and
functions.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@290857 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed