YJIT: Add missing prepare before calling str_dup

Author: jhawthorn

yjit/src/codegen.rs

@@ -6123,7 +6123,7 @@ fn jit_rb_str_to_s(
 }
 
 fn jit_rb_str_dup(
-    _jit: &mut JITState,
+    jit: &mut JITState,
     asm: &mut Assembler,
     _ci: *const rb_callinfo,
     _cme: *const rb_callable_method_entry_t,
@@ -6137,6 +6137,8 @@ fn jit_rb_str_dup(
     }
     asm_comment!(asm, "String#dup");
 
+    jit_prepare_call_with_gc(jit, asm);
+
     // Check !FL_ANY_RAW(str, FL_EXIVAR), which is part of BARE_STRING_P.
     let recv_opnd = asm.stack_pop(1);
     let recv_opnd = asm.load(recv_opnd);