Break out bool/true/false support into a LangOption



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44164 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/clang.cpp b/Driver/clang.cpp
index 5897da3..b31cee4 100644
--- a/Driver/clang.cpp
+++ b/Driver/clang.cpp
@@ -316,6 +316,7 @@
   case lang_cxx98:
     Options.CPlusPlus = 1;
     Options.CXXOperatorNames = !NoOperatorNames;
+    Options.Boolean = 1;
     // FALL THROUGH.
   case lang_gnu99:
   case lang_c99: