ZJIT: Make --zjit-dump-hir work with HIR opt disabled (ruby#14242)

Author: k0kubun

zjit/src/codegen.rs

@@ -1313,6 +1313,7 @@ fn compile_iseq(iseq: IseqPtr) -> Option<Function> {
     if !get_option!(disable_hir_opt) {
         function.optimize();
     }
+    function.dump_hir();
     #[cfg(debug_assertions)]
     if let Err(err) = function.validate() {
         debug!("ZJIT: compile_iseq: {err:?}");

zjit/src/hir.rs

@@ -2143,7 +2143,10 @@ impl Function {
         #[cfg(debug_assertions)] self.assert_validates();
         self.eliminate_dead_code();
         #[cfg(debug_assertions)] self.assert_validates();
+    }
 
+    /// Dump HIR passed to codegen if specified by options.
+    pub fn dump_hir(&self) {
         // Dump HIR after optimization
         match get_option!(dump_hir_opt) {
             Some(DumpHIR::WithoutSnapshot) => println!("Optimized HIR:\n{}", FunctionPrinter::without_snapshot(&self)),
@@ -2157,7 +2160,6 @@ impl Function {
         }
     }
 
-
     /// Validates the following:
     /// 1. Basic block jump args match parameter arity.
     /// 2. Every terminator must be in the last position.