pic16 doesn't have a Data64bitsDirective. Set it NULL explicitly to tell the generic code to not pick the default.

llvm-svn: 74839
diff --git a/llvm/lib/Target/PIC16/PIC16TargetAsmInfo.cpp b/llvm/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
index a81c95f..979fadf 100644
--- a/llvm/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
+++ b/llvm/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
@@ -30,6 +30,7 @@
   Data8bitsDirective = " db ";
   Data16bitsDirective = " dw ";
   Data32bitsDirective = " dl ";
+  Data64bitsDirective = NULL;
   RomData8bitsDirective = " dw ";
   RomData16bitsDirective = " rom_di ";
   RomData32bitsDirective = " rom_dl ";