[BOLT][WIP] Check dynamic relocations in analyzeJumpTable

[Amir]

Summary

perf2bolt-multiple-edge.test has jump table entries with associated dynamic
relocations. Check their presence in analyzeJumpTable.

Test WIP

[maksfb]

Not sure how to reproduce with assembly.

Can you try a test case with goto labels compiled with PIC?

[Amir]

Check Section->isRelro

bolt/lib/Core/BinaryContext.cpp

for (uint64_t EntryAddress = Address; EntryAddress <= UpperBound - EntrySize;
     // Check if there's a proper relocation against the jump table entry.
     if (HasRelocations) {
       if (Type == JumpTable::JTT_PIC &&
           !DataPCRelocations.count(EntryAddress)) {
         LLVM_DEBUG(
             dbgs() << "FAIL: JTT_PIC table, no relocation for this address\n");
         break;
       }
-      if (Type == JumpTable::JTT_NORMAL && !getRelocationAt(EntryAddress)) {
+      if (Type == JumpTable::JTT_NORMAL && !getRelocationAt(EntryAddress) &&
+          !getDynamicRelocationAt(EntryAddress)) {
         LLVM_DEBUG(
             dbgs()
             << "FAIL: JTT_NORMAL table, no relocation for this address\n");
         break;
       }
     }
 
     const uint64_t Value =