YJIT: add counter for untracked gbpp exit reason (#8052)

Merged-By: maximecb <maximecb@ruby-lang.org>

yjit/src/codegen.rs

@@ -7649,6 +7649,7 @@ fn gen_getblockparamproxy(
     // When a block handler is present, it should always be a GC-guarded
     // pointer (VM_BH_ISEQ_BLOCK_P)
     if comptime_handler.as_u64() != 0 && comptime_handler.as_u64() & 0x3 != 0x1 {
+        incr_counter!(gbpp_not_gc_guarded);
         return None;
     }
 

yjit/src/stats.rs

@@ -354,6 +354,7 @@ make_counters! {
     expandarray_rhs_too_small,
 
     gbp_wb_required,
+    gbpp_not_gc_guarded,
     gbpp_block_param_modified,
     gbpp_block_handler_not_none,
     gbpp_block_handler_not_iseq,