[libc] Silence warnings when building GPU tests (#82701)

Summary:
This patch silences two warnings that may occur during the building of
GPU tests. These are not informative or helpful and just make the test
output longer.

Author: jhuber6

libc/cmake/modules/LLVMLibCCompileOptionRules.cmake

@@ -158,12 +158,12 @@ function(_get_hermetic_test_compile_options output_var flags)
   # The GPU build requires overriding the default CMake triple and architecture.
   if(LIBC_TARGET_ARCHITECTURE_IS_AMDGPU)
     list(APPEND compile_options
-         -nogpulib -mcpu=${LIBC_GPU_TARGET_ARCHITECTURE} -flto
+         -Wno-multi-gpu -nogpulib -mcpu=${LIBC_GPU_TARGET_ARCHITECTURE} -flto
          -mcode-object-version=${LIBC_GPU_CODE_OBJECT_VERSION})
   elseif(LIBC_TARGET_ARCHITECTURE_IS_NVPTX)
     list(APPEND compile_options
          "SHELL:-mllvm -nvptx-emit-init-fini-kernel=false"
-         --cuda-path=${LIBC_CUDA_ROOT}
+         -Wno-multi-gpu --cuda-path=${LIBC_CUDA_ROOT}
          -nogpulib -march=${LIBC_GPU_TARGET_ARCHITECTURE} -fno-use-cxa-atexit)
   endif()
   set(${output_var} ${compile_options} PARENT_SCOPE)

libc/cmake/modules/LLVMLibCTestRules.cmake

@@ -470,6 +470,7 @@ function(add_integration_test test_name)
     # We need to use the internal object versions for NVPTX.
     set(internal_suffix ".__internal__")
     target_link_options(${fq_build_target_name} PRIVATE 
+      "-Wl,--suppress-stack-size-warning"
       -march=${LIBC_GPU_TARGET_ARCHITECTURE} -nostdlib -static
       "--cuda-path=${LIBC_CUDA_ROOT}")
   elseif(LIBC_CC_SUPPORTS_NOSTDLIBPP)
@@ -650,6 +651,7 @@ function(add_libc_hermetic_test test_name)
     # We need to use the internal object versions for NVPTX.
     set(internal_suffix ".__internal__")
     target_link_options(${fq_build_target_name} PRIVATE 
+      "-Wl,--suppress-stack-size-warning"
       -march=${LIBC_GPU_TARGET_ARCHITECTURE} -nostdlib -static
       "--cuda-path=${LIBC_CUDA_ROOT}")
   elseif(LIBC_CC_SUPPORTS_NOSTDLIBPP)