[llvm] [AArch64][SME] Introduce CHECK_MATCHING_VL pseudo for streaming transitions (PR #157510)

[Benjamin Maxwell via llvm-commits]

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@@ -0,0 +1,484 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve,+sme,+sme2p1 < %s | FileCheck %s
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MacDue wrote:

nit: Add `-verify-machineinstrs`
```suggestion
; RUN: llc -mtriple=aarch64-linux-gnu -mattr=+sve,+sme,+sme2p1 -verify-machineinstrs < %s | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/157510