[GR-19205] Mark a few loops as FULL_UNROLL_UNTIL_RETURN

* For LookupPackedEntryNode, this means the code until the `return`s in
  the loop is duplicated, which makes the index to read the value constant
  in compiled code.

Author: eregon

src/main/java/org/truffleruby/core/hash/LookupPackedEntryNode.java

@@ -9,6 +9,7 @@
  */
 package org.truffleruby.core.hash;
 
+import com.oracle.truffle.api.nodes.ExplodeLoop.LoopExplosionKind;
 import org.truffleruby.Layouts;
 import org.truffleruby.collections.BiFunctionNode;
 import org.truffleruby.language.RubyBaseNode;
@@ -87,7 +88,7 @@ protected int getSize(DynamicObject hash) {
         return Layouts.HASH.getSize(hash);
     }
 
-    @ExplodeLoop
+    @ExplodeLoop(kind = LoopExplosionKind.FULL_UNROLL_UNTIL_RETURN)
     @Specialization(replaces = "getConstantIndexPackedArray")
     protected Object getPackedArray(VirtualFrame frame, DynamicObject hash, Object key, int hashed,
             BiFunctionNode defaultValueNode,
@@ -110,7 +111,6 @@ protected Object getPackedArray(VirtualFrame frame, DynamicObject hash, Object k
 
         notInHashProfile.enter();
         return defaultValueNode.accept(frame, hash, key);
-
     }
 
     protected boolean equalKeys(boolean compareByIdentity, Object key, int hashed, Object otherKey, int otherHashed) {

src/main/java/org/truffleruby/core/hash/SetNode.java

@@ -9,6 +9,7 @@
  */
 package org.truffleruby.core.hash;
 
+import com.oracle.truffle.api.nodes.ExplodeLoop.LoopExplosionKind;
 import org.truffleruby.Layouts;
 import org.truffleruby.language.RubyBaseNode;
 import org.truffleruby.language.objects.shared.PropagateSharingNode;
@@ -59,7 +60,7 @@ protected Object setNull(DynamicObject hash, Object originalKey, Object value, b
         return value;
     }
 
-    @ExplodeLoop
+    @ExplodeLoop(kind = LoopExplosionKind.FULL_UNROLL_UNTIL_RETURN)
     @Specialization(guards = "isPackedHash(hash)")
     protected Object setPackedArray(DynamicObject hash, Object originalKey, Object value, boolean byIdentity,
             @Cached("createBinaryProfile()") ConditionProfile strategyProfile) {

src/main/java/org/truffleruby/language/exceptions/TryNode.java

@@ -78,7 +78,7 @@ public Object execute(VirtualFrame frame) {
         }
     }
 
-    @ExplodeLoop(kind = LoopExplosionKind.FULL_EXPLODE_UNTIL_RETURN)
+    @ExplodeLoop(kind = LoopExplosionKind.FULL_UNROLL_UNTIL_RETURN)
     private Object handleException(VirtualFrame frame, RaiseException exception) {
         for (RescueNode rescue : rescueParts) {
             if (rescue.canHandle(frame, exception.getException())) {