Integer optimization is not executed

Integer optimization is not executed because BytecodeInterface8.isOrigZ() which is for boolean optimization and always returns false is called instead of BytecodeInterface8.isOrigInt().

Steps to confirm the problem:

1. Save the following script as Test.groovy

   int fib(int n) {
       if (n < 2) return n
       return rcfib(n - 1) + rcfib(n - 2)
   }
   

2. Compile Test.groovy using groovyc

   groovyc Test.groovy

3. Disassemble the Test.class

   javap -c Test

4. You can see BytecodeInterface8.isOrigZ is called

     public int fib(int);
       Code:
          0: invokestatic  #20                 // Method $getCallSiteArray:()[Lorg/codehaus/groovy/runtime/callsite/CallSite;
          3: astore_2      
          4: invokestatic  #66                 // Method org/codehaus/groovy/runtime/BytecodeInterface8.isOrigZ:()Z
          7: ifeq          25
         10: getstatic     #68                 // Field __$stMC:Z
         13: ifne          25
         16: invokestatic  #71                 // Method org/codehaus/groovy/runtime/BytecodeInterface8.disabledStandardMetaClass:()Z
         19: ifne          25
         :
         :