llvmpipe: include gallivm perf flags in shader cache.

Otherwise if you set perf flags, then don't set them,
they won't take affect.

Fixes: 6c0c61cb48 ("llvmpipe: add infrastructure for disk cache support")
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6630>
(cherry picked from commit 4df0eef188)

.pick_status.json

@@ -967,7 +967,7 @@
         "description": "llvmpipe: include gallivm perf flags in shader cache.",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": "6c0c61cb48e87d9b0fc545cf30016d3947a47b6a"
     },

src/gallium/auxiliary/gallivm/lp_bld_init.c

@@ -721,3 +721,8 @@ gallivm_jit_function(struct gallivm_state *gallivm,
 
    return jit_func;
 }
+
+unsigned gallivm_get_perf_flags(void)
+{
+   return gallivm_perf;
+}

src/gallium/auxiliary/gallivm/lp_bld_init.h

@@ -85,6 +85,8 @@ func_pointer
 gallivm_jit_function(struct gallivm_state *gallivm,
                      LLVMValueRef func);
 
+unsigned gallivm_get_perf_flags(void);
+
 #ifdef __cplusplus
 }
 #endif

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -793,6 +793,7 @@ llvmpipe_get_timestamp(struct pipe_screen *_screen)
 static void lp_disk_cache_create(struct llvmpipe_screen *screen)
 {
    struct mesa_sha1 ctx;
+   unsigned gallivm_perf = gallivm_get_perf_flags();
    unsigned char sha1[20];
    char cache_id[20 * 2 + 1];
    _mesa_sha1_init(&ctx);
@@ -801,6 +802,7 @@ static void lp_disk_cache_create(struct llvmpipe_screen *screen)
        !disk_cache_get_function_identifier(LLVMLinkInMCJIT, &ctx))
       return;
 
+   _mesa_sha1_update(&ctx, &gallivm_perf, sizeof(gallivm_perf));
    _mesa_sha1_final(&ctx, sha1);
    disk_cache_format_hex_id(cache_id, sha1, 20 * 2);