Re-use shared WASM Prism instance

The parser should be stateless and a new machine is constructed for
each call, so we should be able to reuse the same Prism instance
across parses.

Author: headius

src/main/java/org/jruby/prism/parser/ParserPrismWasm.java

@@ -24,13 +24,13 @@
 import static org.jruby.parser.ParserType.EVAL;
 
 public class ParserPrismWasm extends ParserPrismBase {
+    private static final Prism prism = new Prism();
+
     public ParserPrismWasm(Ruby runtime) {
         super(runtime);
     }
 
     protected byte[] parse(byte[] source, int sourceLength, byte[] metadata) {
-        try (Prism prism = new Prism()) {
-            return prism.serialize(metadata, source, sourceLength);
-        }
+        return prism.serialize(metadata, source, sourceLength);
     }
 }