[scudo] Fix isOwned on MTE devices. (llvm#110717)

If called on an address that is actually not owned, the header tag might not
match. This would cause an MTE fault in Chunk::isValid.

Disable tag checks in isOwned().

Author: eugenis

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

@@ -785,6 +785,8 @@ class Allocator {
   // A corrupted chunk will not be reported as owned, which is WAI.
   bool isOwned(const void *Ptr) {
     initThreadMaybe();
+    // If the allocation is not owned, the tags could be wrong.
+    ScopedDisableMemoryTagChecks x;
 #ifdef GWP_ASAN_HOOKS
     if (GuardedAlloc.pointerIsMine(Ptr))
       return true;