[llvm] [Offload][cmake] Add GPU test job limit for AMDGPU buildbot cmake cache (PR #146611)

[via llvm-commits]

https://github.com/Kewen12 created https://github.com/llvm/llvm-project/pull/146611

Added GPU test job limit to make it consistent with current config https://github.com/llvm/llvm-zorg/blob/main/buildbot/osuosl/master/config/builders.py#L2027C31-L2027C77

>From a5e57ebb00a189a412b92de8ce734039ff67501f Mon Sep 17 00:00:00 2001
From: Kewen Meng <kewen.meng at amd.com>
Date: Tue, 1 Jul 2025 18:44:35 -0500
Subject: [PATCH] [Offload][cmake] Add GPU test job limit for AMDGPU buildbot
 cmake cache

Added GPU test job limit to make it consistent with current config https://github.com/llvm/llvm-zorg/blob/main/buildbot/osuosl/master/config/builders.py#L2027C31-L2027C77
---
 offload/cmake/caches/AMDGPULibcBot.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/offload/cmake/caches/AMDGPULibcBot.cmake b/offload/cmake/caches/AMDGPULibcBot.cmake
index 728dfe3f0a3f1..a772043c79669 100644
--- a/offload/cmake/caches/AMDGPULibcBot.cmake
+++ b/offload/cmake/caches/AMDGPULibcBot.cmake
@@ -18,3 +18,4 @@ set(CLANG_DEFAULT_RTLIB "compiler-rt" STRING "")
 
 set(LLVM_RUNTIME_TARGETS default;amdgcn-amd-amdhsa CACHE STRING "")
 set(RUNTIMES_amdgcn-amd-amdhsa_LLVM_ENABLE_RUNTIMES "compiler-rt;libc" CACHE STRING "")
+set(RUNTIMES_amdgcn-amd-amdhsa_LIBC_GPU_TEST_JOBS 4 CACHE STRING "")