Add missed runtime_exact_ruby_class case for Regexp

Author: st0012

zjit/src/hir_type/mod.rs

@@ -403,6 +403,7 @@ impl Type {
         if self.is_subtype(types::NilClassExact) { return Some(unsafe { rb_cNilClass }); }
         if self.is_subtype(types::ObjectExact) { return Some(unsafe { rb_cObject }); }
         if self.is_subtype(types::RangeExact) { return Some(unsafe { rb_cRange }); }
+        if self.is_subtype(types::RegexpExact) { return Some(unsafe { rb_cRegexp }); }
         if self.is_subtype(types::SetExact) { return Some(unsafe { rb_cSet }); }
         if self.is_subtype(types::StringExact) { return Some(unsafe { rb_cString }); }
         if self.is_subtype(types::SymbolExact) { return Some(unsafe { rb_cSymbol }); }