[llvm] Adding the support for vectorization of loops with load based tripcount (PR #209390)

[Manish Srivastava via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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mk-srivastava wrote:

I have made the suggested changes. Please have a look. 

https://github.com/llvm/llvm-project/pull/209390