[CommandLine] Provide parser<unsigned long> instantiation to allow cl::opt<uint64_t> on LP64 platforms

Summary:
And migrate opt<unsigned long long> to opt<uint64_t>

Fixes PR19665

Differential Revision: https://reviews.llvm.org/D60933

llvm-svn: 359068
diff --git a/llvm/tools/llvm-cfi-verify/lib/GraphBuilder.h b/llvm/tools/llvm-cfi-verify/lib/GraphBuilder.h
index dc96e0b..60fb78f 100644
--- a/llvm/tools/llvm-cfi-verify/lib/GraphBuilder.h
+++ b/llvm/tools/llvm-cfi-verify/lib/GraphBuilder.h
@@ -46,8 +46,8 @@
 namespace llvm {
 namespace cfi_verify {
 
-extern unsigned long long SearchLengthForUndef;
-extern unsigned long long SearchLengthForConditionalBranch;
+extern uint64_t SearchLengthForUndef;
+extern uint64_t SearchLengthForConditionalBranch;
 
 struct ConditionalBranchNode {
   uint64_t Address;