[llvm] ARM: Simplify logic for default libcall calling convention (PR #152166)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm created https://github.com/llvm/llvm-project/pull/152166

Not sure why this was listing all the darwin variants individually

>From 2bcb171f7c882455ce28d9bfa3ee55de7a444af0 Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault at amd.com>
Date: Wed, 6 Aug 2025 00:39:33 +0900
Subject: [PATCH] ARM: Simplify logic for default libcall calling convention

Not sure why this was listing all the darwin variants individually
---
 llvm/include/llvm/IR/RuntimeLibcalls.td | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/llvm/include/llvm/IR/RuntimeLibcalls.td b/llvm/include/llvm/IR/RuntimeLibcalls.td
index 5d1015e585e47..553a302aa47b6 100644
--- a/llvm/include/llvm/IR/RuntimeLibcalls.td
+++ b/llvm/include/llvm/IR/RuntimeLibcalls.td
@@ -1511,10 +1511,9 @@ def ARMSystemLibrary
                                                   (!TT.isiOS() || !TT.isOSVersionLT(5, 0))}]>>,
            DefaultStackProtector)> {
   let DefaultLibcallCallingConv = LibcallCallingConv<[{
-     (!TT.isOSDarwin() && !TT.isiOS() && !TT.isWatchOS() && !TT.isDriverKit()) ?
+     TT.isOSDarwin() ? CallingConv::C :
         (FloatABI == FloatABI::Hard ? CallingConv::ARM_AAPCS_VFP
-                                    : CallingConv::ARM_AAPCS) :
-                                      CallingConv::C
+                                    : CallingConv::ARM_AAPCS)
   }]>;
 }