[Sanitizer] Refactor SanitizerArgs parsing in Driver.

Remove flag parsing details from the public header.
Use SanitizerSet to represent the set of enabled sanitizers.
Cleanup the implementation: update the comments to
reflect reality, remove dead code.

No functionality change.

llvm-svn: 221968

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Basic/Sanitizers.cpp b/clang/lib/Basic/Sanitizers.cpp
index 7bc884dd015..e9aaa366e32 100644
--- a/clang/lib/Basic/Sanitizers.cpp
+++ b/clang/lib/Basic/Sanitizers.cpp
@@ -29,3 +29,7 @@ void SanitizerSet::set(SanitizerKind K, bool Value) {
 void SanitizerSet::clear() {
   Kinds = 0;
 }
+
+bool SanitizerSet::empty() const {
+  return Kinds == 0;
+}