Implement Allman style.

Patch by Frank Miller.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187678 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/Format.cpp b/lib/Format/Format.cpp
index 02cbc31..140bda2 100644
--- a/lib/Format/Format.cpp
+++ b/lib/Format/Format.cpp
@@ -50,6 +50,7 @@
     IO.enumCase(Value, "Attach", clang::format::FormatStyle::BS_Attach);
     IO.enumCase(Value, "Linux", clang::format::FormatStyle::BS_Linux);
     IO.enumCase(Value, "Stroustrup", clang::format::FormatStyle::BS_Stroustrup);
+    IO.enumCase(Value, "Allman", clang::format::FormatStyle::BS_Allman);
   }
 };