RFR(XS): 8072844: Use more efficient LambdaForm type representation

[Michael Haupt]

Hi Ulf,

the change (as of webrev.01) is pushed. Nevertheless, thanks for your comments - responses below.

> Am 03.12.2015 um 15:40 schrieb Ulf <Ulf.Zibis at CoSoCo.de>:
> why not simply? :
> 1282         MethodType type = mt.changeParameterType(0, MethodHandle.class);
> 
> In any case, the state of the external mt becomes changed, so better clone mt.

Cloning mt here is not necessary, as changeParameterType() will create a new MT instance. If that's what you mean.

> Additional suggestion to save the in and out packing with MethodType:
> 1279     static MemberName generateLambdaFormInterpreterEntryPoint(Type rType, Type[] pTypes) {

A MethodType is an apt abstraction for what is needed here; I don't think breaking it up into its components would help much.

Thanks,

Michael

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