test: Ignore a failing test on LLDB

Re-enabling it is tracked in #27089

Author: alexcrichton

Diff for: src/test/debuginfo/generic-enum-with-different-disr-sizes.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-tidy-linelength
+// ignore-lldb: FIXME(#27089)
 // min-lldb-version: 310
 
 // compile-flags:-g