[clang] [CIR][AArch64] Lower NEON subtraction intrinsics (PR #202857)

[Andrzej Warzyński via cfe-commits]

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+// REQUIRES: aarch64-registered-target || arm-registered-target
+
+// RUN:                   %clang_cc1_cg_arm64_neon           -emit-llvm %s -disable-O0-optnone | opt -S -passes=mem2reg,sroa | FileCheck %s --check-prefixes=LLVM
+// RUN: %if cir-enabled %{%clang_cc1_cg_arm64_neon -fclangir -emit-llvm %s -disable-O0-optnone | opt -S -passes=mem2reg,sroa | FileCheck %s --check-prefixes=LLVM %}
+// RUN: %if cir-enabled %{%clang_cc1_cg_arm64_neon -fclangir -emit-cir  %s -disable-O0-optnone |                               FileCheck %s --check-prefixes=CIR %}
+
+//=============================================================================
+// NOTES
+//
+// Tests for vector permutation intrinsics: Subtraction, Widening subtraction, Narrowing subtraction and Saturating subtract elements.
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banach-space wrote:

;-)
```suggestion
// Tests for vector subtraction intrinsics: Subtraction, Widening subtraction, Narrowing subtraction and Saturating subtract elements.
```

https://github.com/llvm/llvm-project/pull/202857