IAE thrown when indy string concat is used in another named module. Need to enhance indy string concat to get access cross module boundary. Without it, jake build fails with:

Creating java.base.jmod
Exception in thread "main" java.lang.BootstrapMethodError: call site initialization exception
at java.lang.invoke.CallSite.makeSite(java.base/CallSite.java:347)
at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(java.base/MethodHandleNatives.java:245)
at java.lang.invoke.MethodHandleNatives.linkCallSite(java.base/MethodHandleNatives.java:235)
at jdk.tools.jmod.JmodTask$GlobConverter.convert(jdk.jlink/JmodTask.java:835)
at jdk.tools.jmod.JmodTask$GlobConverter.convert(jdk.jlink/JmodTask.java:831)
at jdk.internal.joptsimple.internal.Reflection.convertWith(jdk.internal.opt/Reflection.java:158)
at jdk.internal.joptsimple.AbstractOptionSpec.convertWith(jdk.internal.opt/AbstractOptionSpec.java:121)
...
Caused by: java.lang.IllegalAccessException: symbolic reference class is not accessible: class java.lang.String$Concat/703504298, from jdk.tools.jmod.JmodTask$GlobConverter (module jdk.jlink)
   at java.lang.invoke.MemberName.makeAccessException(java.base/MemberName.java:870)
   at java.lang.invoke.MethodHandles$Lookup.checkSymbolicClass(java.base/MethodHandles.java:1493)
   at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(java.base/MethodHandles.java:1473)
   at java.lang.invoke.MethodHandles$Lookup.findStatic(java.base/MethodHandles.java:829)
   at java.lang.invoke.StringConcatFactory$BytecodeStringBuilderStrategy.generate(java.base/StringConcatFactory.java:1028)

Caused by: java.lang.IllegalAccessException: symbolic reference class is not accessible: class java.lang.String$Concat/703504298, from jdk.tools.jmod.JmodTask$GlobConverter (module jdk.jlink)
   at java.lang.invoke.MemberName.makeAccessException(java.base/MemberName.java:870)
   at java.lang.invoke.MethodHandles$Lookup.checkSymbolicClass(java.base/MethodHandles.java:1493)
   at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(java.base/MethodHandles.java:1473)
   at java.lang.invoke.MethodHandles$Lookup.findStatic(java.base/MethodHandles.java:829)
   at java.lang.invoke.StringConcatFactory$BytecodeStringBuilderStrategy.generate(java.base/StringConcatFactory.java:1028)
   ... 16 more