[clang] [Clang][AArch64] Warn when calling streaming/non-streaming about vect… (PR #79842)

[Dinar Temirbulatov via cfe-commits]

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@@ -3717,6 +3717,30 @@ def err_sme_definition_using_za_in_non_sme_target : Error<
   "function using ZA state requires 'sme'">;
 def err_sme_definition_using_zt0_in_non_sme2_target : Error<
   "function using ZT0 state requires 'sme2'">;
+def warn_sme_streaming_caller_pass_args_to_non_streaming : Warning<
+  "streaming caller passes a VL-dependent argument to non-streaming callee, "
+  "the streaming and non-streaming vector lengths may be different">,
+  InGroup<IgnoredAttributes>;
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dtemirbulatov wrote:

But why not, There is `warn_riscv_repeated_interrupt_attribute` also uses `IgnoredAttributes`.

https://github.com/llvm/llvm-project/pull/79842