Don't store copied methods in BSS.

Otherwise, we can end up in a state where the method on the stack is
unrelated to the receiver.

Also fix a comment related to GetCanonicalMethod and
StackVisitor::ValidateFrame.

Test: 810-checker-invoke-super-default
Change-Id: I3030e4af6059f7a4a7a1f046f2aabae8ce9057da
diff --git a/runtime/stack.cc b/runtime/stack.cc
index a20f40c..094c25b 100644
--- a/runtime/stack.cc
+++ b/runtime/stack.cc
@@ -711,8 +711,8 @@
     LinearAlloc* const linear_alloc = runtime->GetLinearAlloc();
     if (!linear_alloc->Contains(method)) {
       // Check class linker linear allocs.
-      // We get the canonical method as copied methods may have their declaring
-      // class from another class loader.
+      // We get the canonical method as copied methods may have been allocated
+      // by a different class loader.
       const PointerSize ptrSize = runtime->GetClassLinker()->GetImagePointerSize();
       ArtMethod* canonical = method->GetCanonicalMethod(ptrSize);
       ObjPtr<mirror::Class> klass = canonical->GetDeclaringClass();