[llvm] Bug fixes for ISelLowering for HVX (PR #164416)

[Fateme Hosseini via llvm-commits]

================
@@ -0,0 +1,89 @@
+;; RUN: llc --mtriple=hexagon -mattr=+hvxv79,+hvx-length128b %s -o - | FileCheck %s
+;; Sanity check for lowering masked scatter without assertion errors.
+
----------------
fhossein-quic wrote:

Could you please elaborate the issue? This is how @SergeiYLarin designed the test, so I need more context. If it's necessary and not something critical, we probably can do it in a separate patch.

https://github.com/llvm/llvm-project/pull/164416