[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/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index d73907c..952ace5 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -321,10 +321,10 @@
                                    cl::desc("scale of asan shadow mapping"),
                                    cl::Hidden, cl::init(0));
 
-static cl::opt<unsigned long long> ClMappingOffset(
-    "asan-mapping-offset",
-    cl::desc("offset of asan shadow mapping [EXPERIMENTAL]"), cl::Hidden,
-    cl::init(0));
+static cl::opt<uint64_t>
+    ClMappingOffset("asan-mapping-offset",
+                    cl::desc("offset of asan shadow mapping [EXPERIMENTAL]"),
+                    cl::Hidden, cl::init(0));
 
 // Optimization flags. Not user visible, used mostly for testing
 // and benchmarking the tool.