message: add new LLVM bug
diff: @@ -52,6 +52,7 @@ Please contact us or submit a PR if something is missing or inaccurate.
  45. Incorrect transformation of fabs with nnan flag (https://llvm.org/PR47960)
  46. Loop peeling introduces OOB stores (https://llvm.org/PR48125)
  47. Loop vectorizer introduces gep inbounds with negative offset (https://llvm.org/PR48126)
  +48. DSE incorrectly removes store in function that only triggers UB in one of the branches (https://llvm.org/PR48521)
  ### Bugs found in Z3
  