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/compiler/optimizing/sharpening.cc b/compiler/optimizing/sharpening.cc
index 67cd200..393369d 100644
--- a/compiler/optimizing/sharpening.cc
+++ b/compiler/optimizing/sharpening.cc
@@ -99,6 +99,7 @@
     } else if (!has_method_id) {
       method_load_kind = MethodLoadKind::kRuntimeCall;
     } else {
+      DCHECK(!callee->IsCopied());
       // Use PC-relative access to the .bss methods array.
       method_load_kind = MethodLoadKind::kBssEntry;
     }
@@ -124,6 +125,7 @@
     method_load_kind = MethodLoadKind::kRuntimeCall;
     code_ptr_location = CodePtrLocation::kCallArtMethod;
   } else {
+    DCHECK(!callee->IsCopied());
     // Use PC-relative access to the .bss methods array.
     method_load_kind = MethodLoadKind::kBssEntry;
     code_ptr_location = CodePtrLocation::kCallArtMethod;