[Polly] Remove unused variable 'IdentTy' in LoopGeneratorsKMP.cpp (NFC)

/llvm-project/polly/lib/CodeGen/LoopGeneratorsKMP.cpp:396:15: error: unused variable 'IdentTy' [-Werror,-Wunused-variable]
  StructType *IdentTy =
              ^
/llvm-project/polly/lib/CodeGen/LoopGeneratorsKMP.cpp:460:15: error: unused variable 'IdentTy' [-Werror,-Wunused-variable]
  StructType *IdentTy =
              ^
2 errors generated.

GitOrigin-RevId: f42785d0c8886a65fbdd160b0ef47baa5931e582
1 file changed