Introduce a SanitizerKind enum to LangOptions.

Use the bitmask to store the set of enabled sanitizers instead of a
bitfield. On the negative side, it makes syntax for querying the
set of enabled sanitizers a bit more clunky. On the positive side, we
will be able to use SanitizerKind to eventually implement the
new semantics for -fsanitize-recover= flag, that would allow us
to make some sanitizers recoverable, and some non-recoverable.

No functionality change.

llvm-svn: 221558

clang/lib/CodeGen/CGClass.cpp

@@ -834,8 +834,8 @@ namespace {
   public:
     explicit CopyingValueRepresentation(CodeGenFunction &CGF)
         : CGF(CGF), OldSanOpts(CGF.SanOpts) {
-      CGF.SanOpts.Bool = false;
-      CGF.SanOpts.Enum = false;
+      CGF.SanOpts.set(SanitizerKind::Bool, false);
+      CGF.SanOpts.set(SanitizerKind::Enum, false);
     }
     ~CopyingValueRepresentation() {
       CGF.SanOpts = OldSanOpts;