mesa: added some debug code (disabled)

cherry-picked from master

src/mesa/shader/slang/slang_compile.c

@@ -2129,6 +2129,12 @@ compile_shader(GLcontext *ctx, slang_code_object * object,
    GLboolean success;
    grammar id = 0;
 
+#if 0 /* for debug */
+   _mesa_printf("********* COMPILE SHADER ***********\n");
+   _mesa_printf("%s\n", shader->Source);
+   _mesa_printf("************************************\n");
+#endif
+
    assert(program);
 
    _slang_code_object_dtr(object);

src/mesa/shader/slang/slang_log.c

@@ -86,6 +86,9 @@ slang_info_log_message(slang_info_log * log, const char *prefix,
    }
    slang_string_concat(log->text, msg);
    slang_string_concat(log->text, "\n");
+#if 0 /* debug */
+   _mesa_printf("Mesa GLSL error/warning: %s\n", log->text);
+#endif
    return 1;
 }