Four different programs seem to cause this failure

jjs> function f(){ try { Object; } catch(x if x >>>=0) { throw x2; } finally { } } f()
Exception in thread "main" java.lang.AssertionError
   at jdk.nashorn.internal.ir.Symbol.getSlot(Symbol.java:563)
   at jdk.nashorn.internal.codegen.MethodEmitter.load(MethodEmitter.java:953)
   at jdk.nashorn.internal.codegen.MethodEmitter.emitLocalVariableConversion(MethodEmitter.java:2519)
   at jdk.nashorn.internal.codegen.MethodEmitter.beforeJoinPoint(MethodEmitter.java:2492)
   at jdk.nashorn.internal.codegen.CodeGenerator.enterThrowNode(CodeGenerator.java:2981)
   at jdk.nashorn.internal.ir.ThrowNode.accept(ThrowNode.java:80)
   at jdk.nashorn.internal.ir.Node.accept(Node.java:265)
   at jdk.nashorn.internal.ir.Block.accept(Block.java:178)
   at jdk.nashorn.internal.ir.LexicalContextNode$Acceptor.accept(LexicalContextNode.java:57)
   at jdk.nashorn.internal.ir.Block.accept(Block.java:425)
   ...


jjs> function f(){ try { return; } catch(x) { return x ^= 0; } finally { throw 0; } } f()
Exception in thread "main" java.lang.AssertionError
   at jdk.nashorn.internal.ir.Symbol.getSlot(Symbol.java:555)
   at jdk.nashorn.internal.codegen.MethodEmitter.load(MethodEmitter.java:953)
   at jdk.nashorn.internal.codegen.MethodEmitter.emitLocalVariableConversion(MethodEmitter.java:2519)
   at jdk.nashorn.internal.codegen.MethodEmitter.beforeJoinPoint(MethodEmitter.java:2492)
   at jdk.nashorn.internal.codegen.CodeGenerator.enterThrowNode(CodeGenerator.java:2981)
   at jdk.nashorn.internal.ir.ThrowNode.accept(ThrowNode.java:80)
   at jdk.nashorn.internal.ir.Node.accept(Node.java:265)
   at jdk.nashorn.internal.ir.Block.accept(Block.java:178)
   at jdk.nashorn.internal.ir.LexicalContextNode$Acceptor.accept(LexicalContextNode.java:57)
   at jdk.nashorn.internal.ir.Block.accept(Block.java:425)
   ...


jjs> function f(){ try { return; } catch(x) { return x ^= Object; } finally { throw Object; } } f()
Exception in thread "main" java.lang.AssertionError
   at jdk.nashorn.internal.ir.Symbol.getSlot(Symbol.java:558)
   at jdk.nashorn.internal.codegen.MethodEmitter.load(MethodEmitter.java:953)
   at jdk.nashorn.internal.codegen.MethodEmitter.emitLocalVariableConversion(MethodEmitter.java:2519)
   at jdk.nashorn.internal.codegen.MethodEmitter.beforeJoinPoint(MethodEmitter.java:2492)
   at jdk.nashorn.internal.codegen.CodeGenerator.enterThrowNode(CodeGenerator.java:2981)
   at jdk.nashorn.internal.ir.ThrowNode.accept(ThrowNode.java:80)
   at jdk.nashorn.internal.ir.Node.accept(Node.java:265)
   at jdk.nashorn.internal.ir.Block.accept(Block.java:178)
   at jdk.nashorn.internal.ir.LexicalContextNode$Acceptor.accept(LexicalContextNode.java:57)
   at jdk.nashorn.internal.ir.Block.accept(Block.java:425)
   ...