[mono][aot] Mark clauses as dead when replacing method code with exce…

…ption throw

In the final stages of method compilation, when trying to compute clause ranges, we were asserting because the clause bblocks haven't been reached for compilation.

src/mono/mono/mini/method-to-ir.c

@@ -6263,6 +6263,9 @@ method_make_alwaysthrow_typeloadfailure (MonoCompile* cfg, MonoClass* klass)
 	mono_link_bblock (cfg, bb, cfg->bb_exit);
 
 	cfg->disable_inline = TRUE;
+
+	for (guint i = 0; i < cfg->header->num_clauses; i++)
+		cfg->clause_is_dead [i] = TRUE;
 }
 
 typedef union _MonoOpcodeParameter {