[llvm] [mlir] [clang] [AArch64] Replace LLVM IR function attributes for PSTATE.ZA. (PR #79166)

[Cullen Rhodes via cfe-commits]

================
@@ -22,26 +22,32 @@ Below we describe the LLVM IR attributes and their relation to the C/C++
 level ACLE attributes:
 
 ``aarch64_pstate_sm_enabled``
-    is used for functions with ``__attribute__((arm_streaming))``
+    is used for functions with ``__arm_streaming``
 
 ``aarch64_pstate_sm_compatible``
-    is used for functions with ``__attribute__((arm_streaming_compatible))``
+    is used for functions with ``__arm_streaming_compatible``
 
 ``aarch64_pstate_sm_body``
-  is used for functions with ``__attribute__((arm_locally_streaming))`` and is
+  is used for functions with ``__arm_locally_streaming`` and is
   only valid on function definitions (not declarations)
 
-``aarch64_pstate_za_new``
-  is used for functions with ``__attribute__((arm_new_za))``
+``aarch64_pstate_new_za``
----------------
c-rhodes wrote:

```suggestion
``aarch64_new_za``
```

https://github.com/llvm/llvm-project/pull/79166