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.

llvm-svn: 290857

libcxx/.clang-format

@@ -4,6 +4,12 @@ BasedOnStyle: LLVM
 Language: Cpp
 
 AlwaysBreakTemplateDeclarations: true
+AllowShortFunctionsOnASingleLine: Inline
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterClass: true
+  AfterFunction: true
+PointerAlignment: Left
 
 # Disable formatting options which may break tests.
 SortIncludes: false