[clang] [HLSL] Add 6.2 SM on half availability for length intrinsic (PR #122337)

[Farzon Lotfi via cfe-commits]

https://github.com/farzonl created https://github.com/llvm/llvm-project/pull/122337

- attribute keeps getting deleted on bad rebases

>From 0f0b75dffaefc3460ae8aad7effa75e844ab29ee Mon Sep 17 00:00:00 2001
From: Farzon Lotfi <farzonlotfi at microsoft.com>
Date: Thu, 9 Jan 2025 13:55:33 -0500
Subject: [PATCH] [HLSL] Add 6.2 SM on half availability for length intrinsic -
 attribute keeps getting deleted on bad rebases

---
 clang/lib/Headers/hlsl/hlsl_intrinsics.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index cf287e598f76ba..7105d83078a9d7 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -1297,9 +1297,11 @@ float4 lerp(float4, float4, float4);
 ///
 /// Length is based on the following formula: sqrt(x[0]^2 + x[1]^2 + ...).
 
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 const inline half length(half X) { return __detail::length_impl(X); }
 const inline float length(float X) { return __detail::length_impl(X); }
 
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 template <int N> const inline half length(vector<half, N> X) {
   return __detail::length_vec_impl(X);
 }