oops, restore upstream block of code

Author: kastiglione

lldb/source/lldb.cpp

@@ -65,6 +65,20 @@ const char *lldb_private::GetVersion() {
 #ifdef LLDB_ENABLE_SWIFT
     auto const swift_version = swift::version::getSwiftFullVersion();
     g_version_str += "\n" + swift_version;
+#else
+   // getSwiftFullVersion() also prints clang and llvm versions, no
+   // need to print them again. We keep this code here to not diverge
+   // too much from upstream.
+   std::string clang_rev(clang::getClangRevision());
+   if (clang_rev.length() > 0) {
+     g_version_str += "\n  clang revision ";
+     g_version_str += clang_rev;
+   }
+   std::string llvm_rev(clang::getLLVMRevision());
+   if (llvm_rev.length() > 0) {
+     g_version_str += "\n  llvm revision ";
+     g_version_str += llvm_rev;
+   }
 #endif // LLDB_ENABLE_SWIFT
   }
   return g_version_str.c_str();