[InstCombine] Require ImmConstant in shift of shift fold
This fixes an infinite loop reported at: https://github.com/llvm/llvm-project/commit/82f68a992b9f89036042d57a5f6345cb2925b2c1#commitcomment-132406739
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This fixes an infinite loop reported at: https://github.com/llvm/llvm-project/commit/82f68a992b9f89036042d57a5f6345cb2925b2c1#commitcomment-132406739