ac/llvm: use LLVM processor gfx942 for GFX940 when it's available

Reviewed-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31187>

src/amd/common/amd_family.c

@@ -9,6 +9,10 @@
 #include "util/macros.h"
 #include "ac_gpu_info.h"
 
+#if AMD_LLVM_AVAILABLE
+#include <llvm/Config/llvm-config.h>
+#endif
+
 const char *ac_get_family_name(enum radeon_family family)
 {
    switch (family) {
@@ -208,7 +212,11 @@ const char *ac_get_llvm_processor_name(enum radeon_family family)
    case CHIP_MI200:
       return "gfx90a";
    case CHIP_GFX940:
-      return "gfx940";
+      return
+#if AMD_LLVM_AVAILABLE
+             LLVM_VERSION_MAJOR >= 17 ? "gfx942" :
+#endif
+             "gfx940";
    case CHIP_NAVI10:
       return "gfx1010";
    case CHIP_NAVI12:

src/amd/common/meson.build

@@ -126,7 +126,7 @@ libamd_common = static_library(
   include_directories : [
     inc_include, inc_src, inc_amd,
   ],
-  dependencies : [
+  dependencies : [dep_llvm.partial_dependency(compile_args: true, includes: true)] + [
     dep_thread, dep_elf, dep_libdrm_amdgpu, dep_valgrind,
     idep_mesautil, idep_nir_headers, idep_nir
   ],