[llvm] [LV] Add initial support for partial alias masking (PR #177599)

[Benjamin Maxwell via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --filter-out-after "^scalar.ph:" --version 5
+; RUN: opt -S -mtriple=aarch64-unknown-linux-gnu -mattr=+sve2 -passes=loop-vectorize -force-partial-aliasing-vectorization %s | FileCheck %s
+; RUN: opt -S -mtriple=aarch64-unknown-linux-gnu -mattr=+sve2 -passes=loop-vectorize -force-partial-aliasing-vectorization -prefer-predicate-over-epilogue=predicate-dont-vectorize %s | FileCheck %s --check-prefix=CHECK-TF
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MacDue wrote:

Done. Forced interleaving/epilogue vectorization are ignored when alias-masking is forced (as they're incompatible).

https://github.com/llvm/llvm-project/pull/177599