[clang] [Clang][AArch64] Add customisable immediate range checking to NEON (PR #100278)

[via cfe-commits]

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@@ -76,7 +76,7 @@ let ArchGuard = "defined(__aarch64__) || defined(__arm64ec__)", TargetGuard = "f
   def SCALAR_FCVTPUH  : SInst<"vcvtp_u16", "(1U)1", "Sh">;
   def SCALAR_FCVTPUH1 : SInst<"vcvtp_u32", "(1U>)1", "Sh">;
   def SCALAR_FCVTPUH2 : SInst<"vcvtp_u64", "(1U>>)1", "Sh">;
-  let isVCVT_N = 1 in {
+  let isVCVT_N = 1, ImmChecks = [ImmCheck<1, ImmCheck1_16>] in {
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Lukacma wrote:

I think some ranges are incorrect here( at least according to this [spec](https://developer.arm.com/architectures/instruction-sets/intrinsics/#f:@navigationhierarchiessimdisa=[Neon]&q=vcvth_n_s32) :

vcvt_n_s32/u32 -> 1 to 32
vcvt_n_s64 /u64-> 1 to 64

https://github.com/llvm/llvm-project/pull/100278