Make dicuRangesBaseAddress a Bool

While investigating how to pretty-print `DICompileUnit`'s `rangesBaseAddress`,
I discovered that `rangesBoolAddress` is meant to be printed as a `Bool`, not
as its current type of `Word64`. This commit corrects this oversight.

This is in preparation for a fix for GaloisInc#107.

src/Text/LLVM/AST.hs

@@ -1218,7 +1218,7 @@ data DICompileUnit' lab = DICompileUnit
   , dicuSplitDebugInlining :: Bool
   , dicuDebugInfoForProf   :: Bool
   , dicuNameTableKind      :: Word64
-  , dicuRangesBaseAddress  :: Word64
+  , dicuRangesBaseAddress  :: Bool
   , dicuSysRoot            :: Maybe String
   , dicuSDK                :: Maybe String
   } deriving (Data, Eq, Functor, Generic, Generic1, Ord, Show, Typeable)