[llvm] [MachinePipeliner] Fix fragile tests (PR #123169)

[Ryotaro Kasuga via llvm-commits]

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@@ -0,0 +1,267 @@
+# RUN: llc -mtriple=hexagon -mcpu=hexagonv73 -O2 -mattr=+hvxv73,hvx-length64b \
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kasuga-fj wrote:

Replaced `loop_align_count.ll` with `.mir` to avoid being affected when changing `MachinePipeliner`.

https://github.com/llvm/llvm-project/pull/123169