[clang][NFC] Annotate AnalysisBasedWarning.h with preferred_type

This helps debuggers to display values in bit-fields in a more helpful way.

Author: Endilll

clang/include/clang/Sema/AnalysisBasedWarnings.h

@@ -34,9 +34,13 @@ class AnalysisBasedWarnings {
   class Policy {
     friend class AnalysisBasedWarnings;
     // The warnings to run.
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableCheckFallThrough : 1;
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableCheckUnreachable : 1;
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableThreadSafetyAnalysis : 1;
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableConsumedAnalysis : 1;
   public:
     Policy();