[llvm] [AMDGPU] promote i1 arg type for admgpu_cs (PR #82971)

[Nick Anderson via llvm-commits]

https://github.com/nickleus27 created https://github.com/llvm/llvm-project/pull/82971

fixes #68087 
Not sure where to put regression tests for this pr? Also, should i1 args not in reg also be promoted?

>From 42c132d9b0335c1e96740dc8f37b333d7865dd1a Mon Sep 17 00:00:00 2001
From: Nick Anderson <nickleus27 at gmail.com>
Date: Mon, 26 Feb 2024 01:08:58 -0800
Subject: [PATCH] [AMDGPU] promote i1 arg type for admgpu_cs

---
 llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td b/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td
index c5207228dc913f..a988140df3e89b 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td
+++ b/llvm/lib/Target/AMDGPU/AMDGPUCallingConv.td
@@ -66,6 +66,7 @@ def RetCC_SI_Gfx : CallingConv<[
 
 def CC_SI_SHADER : CallingConv<[
 
+  CCIfType<[i1], CCPromoteToType<i16>>,
   CCIfInReg<CCIfType<[f32, i32, f16, i16, v2i16, v2f16, bf16, v2bf16] , CCAssignToReg<[
     SGPR0, SGPR1, SGPR2, SGPR3, SGPR4, SGPR5, SGPR6, SGPR7,
     SGPR8, SGPR9, SGPR10, SGPR11, SGPR12, SGPR13, SGPR14, SGPR15,