RFR: JDK-8226709: MethodTypeDesc::resolveConstantDesc needs access check per the specification

[Vicente Romero]

Please review fix for [1], at [2]. The implementation of method 
MethodTypeDesc.resolveConstantDes is not in sync with its specification. 
In particular where it says [3]:

Resolves this descriptor reflectively, emulating the resolution behavior 
of JVMS 5.4.3 and the access control behavior of JVMS 5.4.4.
The resolution and access control context is provided by the 
MethodHandles.Lookup parameter.

Thanks,
Vicente

[1] https://bugs.openjdk.java.net/browse/JDK-8226709
[2] http://cr.openjdk.java.net/~vromero/8226709/webrev.00/
[3] 
http://hg.openjdk.java.net/jdk/jdk/file/ae2e53e379cb/src/java.base/share/classes/java/lang/constant/ConstantDesc.java#l89