[llvm] [LV] Relax high loop trip count threshold for deciding to interleave a loop (PR #67725)

[Nilanjana Basu via llvm-commits]

nilanjana87 wrote:

> Resolved conflicts & rebased on latest code. Created separate patch #79651 for addressing the issue with loop interleaving count computation for loops that have to run at least one scalar iteration in the epilogue, as seen in the `limit-vf-by-tripcount.ll` test case, which is otherwise unrelated to the changes in this patch.

Submitted https://github.com/llvm/llvm-project/pull/79651 and rebased this patch on it to fix the regression identified in `limit_main_loop_vf_to_avoid_dead_main_vector_loop` test case in limit-vf-by-tripcount.ll.

https://github.com/llvm/llvm-project/pull/67725