[scudo] Fix definition of canCache() function

The called member function has boolean type, change this function to match

Differential Revision: https://reviews.llvm.org/D122631

compiler-rt/lib/scudo/standalone/secondary.h

@@ -459,7 +459,7 @@ public:
     }
   }
 
-  uptr canCache(uptr Size) { return Cache.canCache(Size); }
+  bool canCache(uptr Size) { return Cache.canCache(Size); }
 
   bool setOption(Option O, sptr Value) { return Cache.setOption(O, Value); }