Check rope.isAsciiOnly() inside the TruffleBoundary

* There is no much gain to check it outside.

Author: eregon

src/main/java/org/truffleruby/core/regexp/ClassicRegexp.java

@@ -669,7 +669,8 @@ private static Encoding processDRegexpElement(RubyContext context, RegexpOptions
     private static final int QUOTED_V = 11;
 
     @TruffleBoundary
-    public static Rope quote19(Rope bs, boolean asciiOnly) {
+    public static Rope quote19(Rope bs) {
+        final boolean asciiOnly = bs.isAsciiOnly();
         int p = 0;
         int end = bs.byteLength();
         final byte[] bytes = bs.getBytes();

src/main/java/org/truffleruby/core/regexp/RegexpNodes.java

@@ -211,7 +211,7 @@ public abstract static class QuoteNode extends CoreMethodArrayArgumentsNode {
         @Specialization(guards = "isRubyString(raw)")
         protected DynamicObject quoteString(DynamicObject raw) {
             final Rope rope = StringOperations.rope(raw);
-            return getMakeStringNode().fromRope(ClassicRegexp.quote19(rope, rope.isAsciiOnly()));
+            return getMakeStringNode().fromRope(ClassicRegexp.quote19(rope));
         }
 
         @Specialization(guards = "isRubySymbol(raw)")

src/main/java/org/truffleruby/core/regexp/TruffleRegexpNodes.java

@@ -39,7 +39,6 @@
 import org.truffleruby.core.regexp.TruffleRegexpNodesFactory.MatchNodeGen;
 import org.truffleruby.core.rope.Rope;
 import org.truffleruby.core.rope.RopeBuilder;
-import org.truffleruby.core.rope.RopeNodes;
 import org.truffleruby.core.rope.RopeOperations;
 import org.truffleruby.core.string.StringNodes;
 import org.truffleruby.core.string.StringNodes.StringAppendPrimitiveNode;
@@ -71,7 +70,6 @@ public static abstract class RegexpUnionNode extends CoreMethodArrayArgumentsNod
         @Child CallDispatchHeadNode copyNode = CallDispatchHeadNode.createPrivate();
         @Child private SameOrEqualNode sameOrEqualNode = SameOrEqualNode.create();
         @Child private StringNodes.MakeStringNode makeStringNode = StringNodes.MakeStringNode.create();
-        @Child private RopeNodes.AsciiOnlyNode asciiOnlyNode = RopeNodes.AsciiOnlyNode.create();
 
         @Specialization(guards = "argsMatch(frame, cachedArgs, args)", limit = "getDefaultCacheLimit()")
         protected Object executeFastUnion(VirtualFrame frame, DynamicObject str, DynamicObject sep, Object[] args,
@@ -101,8 +99,7 @@ public DynamicObject buildUnion(DynamicObject str, DynamicObject sep, Object[] a
         public DynamicObject string(Object obj) {
             if (RubyGuards.isRubyString(obj)) {
                 final Rope rope = StringOperations.rope((DynamicObject) obj);
-                final boolean isAsciiOnly = asciiOnlyNode.execute(rope);
-                return makeStringNode.fromRope(ClassicRegexp.quote19(rope, isAsciiOnly));
+                return makeStringNode.fromRope(ClassicRegexp.quote19(rope));
             } else {
                 return toSNode.execute((DynamicObject) obj);
             }