in some helper instrs I changed StringLiteral to Symbol since they really were

enebo · enebo · commit 6900362de119 · 2018-04-15T12:37:15.000-05:00
symbols.  Changing JVMVisitor to Stringable in a cast fixes one JIT failure
in my recent commit bombing.
diff --git a/core/src/main/java/org/jruby/ir/targets/JVMVisitor.java b/core/src/main/java/org/jruby/ir/targets/JVMVisitor.java
@@ -1983,7 +1983,7 @@ public void RuntimeHelperCall(RuntimeHelperCall runtimehelpercall) {
                 jvmMethod().loadContext();
                 jvmMethod().loadSelf();
                 visit(runtimehelpercall.getArgs()[0]);
-                jvmAdapter().ldc(((StringLiteral) runtimehelpercall.getArgs()[1]).getString());
+                jvmAdapter().ldc(((Stringable) runtimehelpercall.getArgs()[1]).getString());
                 visit(runtimehelpercall.getArgs()[2]);
                 jvmAdapter().invokestatic(p(IRRuntimeHelpers.class), "isDefinedCall", sig(IRubyObject.class, ThreadContext.class, IRubyObject.class, IRubyObject.class, String.class, IRubyObject.class));
                 jvmStoreLocal(runtimehelpercall.getResult());
