fix issues in LLDBMemoryReader::queryDataLayout

Author: kastiglione

lldb/source/Target/SwiftLanguageRuntimeDynamicTypeResolution.cpp

@@ -292,7 +292,7 @@ class LLDBMemoryReader : public swift::remote::MemoryReader {
       } else {
         *result = 0;
       }
-      break;
+      return true;
     }
     case DLQ_GetPointerSize: {
       auto result = static_cast<uint8_t *>(outBuffer);
@@ -304,6 +304,15 @@ class LLDBMemoryReader : public swift::remote::MemoryReader {
       *result = m_process.GetAddressByteSize(); // FIXME: sizeof(size_t)
       return true;
     }
+    case DLQ_GetLeastValidPointerValue: {
+      auto *result = (uint64_t *)outBuffer;
+      auto &triple = m_process.GetTarget().GetArchitecture().GetTriple();
+      if (triple.isOSDarwin() && triple.isArch64Bit())
+        *result = 0x100000000;
+      else
+        *result = 0x1000;
+      return true;
+    }
     }
 
     return false;