[BOLT] Handle jump tables that point to skipped functions

[nhuhuan]

Summary

Functions can be optionally skipped by users, or marked as ignored
during branch target analysis. Since the target function is not
processed, functions that access jump tables which point to these
target functions also need to be marked as ignored.

Test Plan:

ninja check-bolt

[nhuhuan]

Rebase.

bolt/lib/Core/BinaryFunction.cpp

if (JT.Entries.empty()) {
           if (EntryAddress == Parent->getAddress() + Parent->getSize()) {
             IsBuiltIn = true;
             // Specify second parameter as true to accept builtin_unreachable
             MCSymbol *Label = getOrCreateLocalLabel(EntryAddress, true);
             JT.Entries.push_back(Label);
             break;
           }
         }
+
         if (IsBuiltIn)
           continue;
-        // Create local label for targets cannot be reached by other fragments
-        // Otherwise, secondary entry point to target function
+
+        // Functions can be optionally skipped by users, or marked as ignored
+        // during branch target analysis. Since the target function is not
+        // processed, functions that access jump tables which point to these
+        // target functions also need to be marked as ignored
         BinaryFunction *TargetBF =
             BC.getBinaryFunctionContainingAddress(EntryAddress);
+        if (TargetBF->getState() != BinaryFunction::State::Disassembled ||
+            TargetBF->isIgnored()) {
+          setIgnored();
+          return;
+        }
+        // Create local label for targets cannot be reached by other fragments
+        // Otherwise, register as a secondary entry point to target function
         if (TargetBF->getAddress() != EntryAddress) {
           MCSymbol *Label =
               (HasOneParent && TargetBF == this)
                   ? getOrCreateLocalLabel(JT.EntriesAsAddress[I], true)
                   : TargetBF->addEntryPointAtOffset(EntryAddress -
                                                     TargetBF->getAddress());
           JT.Entries.push_back(Label);
         }