llvmc: Make 'true' and 'false' instances of a 'Bool' class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130915 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/CompilerDriver/Common.td b/include/llvm/CompilerDriver/Common.td
index 84e8783..6ba30aa 100644
--- a/include/llvm/CompilerDriver/Common.td
+++ b/include/llvm/CompilerDriver/Common.td
@@ -56,8 +56,11 @@
 def case;
 
 // Boolean constants.
-def true;
-def false;
+class Bool<bit val> {
+      bit Value = val;
+}
+def true : Bool<1>;
+def false : Bool<0>;
 
 // Boolean operators.
 def and;