[scudo] Simple coding style fix in mem_map_base.h (NFC)

[Chia-hungDuan]

Refine comment

[cferris]

LGTM

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

bool remap(uptr Addr, uptr Size, const char *Name, uptr Flags = 0) {
     return invokeImpl(&Derived::remapImpl, Addr, Size, Name, Flags);
   }
 
   // This is used to update the pages' access permission. For example, mark
   // pages as no read/write permission.
   void setMemoryPermission(uptr Addr, uptr Size, uptr Flags) {
     DCHECK(isAllocated());
     DCHECK((Addr >= getBase()) && (Addr + Size <= getBase() + getCapacity()));
-    return static_cast<Derived *>(this)->setMemoryPermissionImpl(Addr, Size,
-                                                                 Flags);
+    return invokeImpl(&Derived::setMemoryPermissionImpl, Addr, Size, Flags);
   }
 
   // Suggest releasing a set of contiguous physical pages back to the OS. Note
   // that only physical pages are supposed to be released. Any release of
   // virtual pages may lead to undefined behavior.
   void releasePagesToOS(uptr From, uptr Size) {
     DCHECK(isAllocated());
     DCHECK((From >= getBase()) && (From + Size <= getBase() + getCapacity()));