freedreno/decode: Add some code to the already present generate-rd

Add some code so that people don't get confused when debugging a
fault and the fault doesn't appear since they forgot to update the
generate-rd.

This should also help catch any build issues earlier on.

Signed-off-by: Karmjit Mahil <karmjit.mahil@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38081>

src/freedreno/decode/generate-rd.cc

@@ -1,7 +1,15 @@
 /* This is a placeholder file that should be replaced with the contents
  * generated by the rddecompiler from a trace file.
 */
+#include "util/macros.h"
+#include "decode/rdcompiler-utils.h"
 int main(int argc, char **argv)
 {
+	UNREACHABLE("you forgot to update generate-rd.cc");
+
+	(void)replay_context_init;
+	(void)replay_context_finish;
+	(void)pkt4;
+
 	return 1;
-}
+}

src/freedreno/decode/meson.build

@@ -141,7 +141,8 @@ if dep_libarchive.found()
   generate_rd = executable(
     'generate_rd',
     [
-      'generate-rd.cc'
+      'generate-rd.cc',
+      freedreno_xml_header_files,
     ],
     include_directories: [
       inc_freedreno,

src/freedreno/decode/rdcompiler-utils.h

@@ -16,6 +16,7 @@
 
 #include "util/u_math.h"
 
+#include "freedreno_pm4.h"
 #include "fd6_hw.h"
 
 #include "ir3/ir3_assembler.h"
@@ -300,7 +301,7 @@ replay_context_finish(struct replay_context *ctx)
    fclose(out);
 }
 
-static void
+UNUSED static void
 upload_shader(struct replay_context *ctx, uint64_t id, const char *source)
 {
    FILE *in = fmemopen((void *)source, strlen(source), "r");
@@ -321,7 +322,7 @@ upload_shader(struct replay_context *ctx, uint64_t id, const char *source)
    _mesa_hash_table_u64_insert(ctx->compiled_shaders, id, shader_iova);
 }
 
-static void
+UNUSED static void
 emit_shader_iova(struct replay_context *ctx, struct cmdstream *cs, uint64_t id)
 {
    uint64_t *shader_iova = (uint64_t *)