Remove all use of is64bit off of NVPTXSubtarget and clean up code
accordingly. This changes the constructors of a number of classes
that don't need to know the subtarget's 64-bitness.

llvm-svn: 229787
diff --git a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
index 7c6ecc3..1a267a6 100644
--- a/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
@@ -88,7 +88,7 @@
                                        CodeGenOpt::Level OL, bool is64bit)
     : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL), is64bit(is64bit),
       TLOF(make_unique<NVPTXTargetObjectFile>()),
-      DL(computeDataLayout(is64bit)), Subtarget(TT, CPU, FS, *this, is64bit) {
+      DL(computeDataLayout(is64bit)), Subtarget(TT, CPU, FS, *this) {
   if (Triple(TT).getOS() == Triple::NVCL)
     drvInterface = NVPTX::NVCL;
   else