Merge changes from TFS

     My previous checking in breaks projectx scenario, since I added one pinvoke RoParseTypeName whose function doesn't exists in current testilc lib folder.

     if a pinvoke with [McgGeneratedNativeCallCodeAttribute] , mcg will just skip this pinvoke
     if a pinvoke without [McgGeneratedNativeCallCodeAttribute], it will do runtime loading if you enable loadlibrary on runtime

[tfs-changeset: 1658653]

Merge changes from TFS

Merge master to nmirror

- Instead of performing lazy lookups at individual use sites, perform a single lazy lookup to get a dictionary, and then use normal canonical lookups from there
- Shares logic with USG dictionary acquisition, and with normal canonical codegen
- Add LazyGenericPolicy nob to CoreRT environment to control policy

Universal Shared Generics Changes
- Fixup EETypeNode generation for USG types
- Consider TemplateTypeLayout necessary for all universal generic canon types
- Use RhAllocLocal2 which returns a byref to the first field of the "local" object instead of the start of the object.
- Tweak USG field invoke map generation to not stop compilation. Still needs to be implemented.

[tfs-changeset: 1658670]

Merge changes from TFS

Merge changes from TFS

…3635)

Missed one check.

Passing a negative length to an api that creates multidim
arrays throws OverflowException rather than ArgumentOutOfRangeException
(presumably due to the assumption that we overflowed while computing
the size rather than a specific bad length being passed in.)

This project builds quickly and building it avoids unpleasant surprises coming through the mirror.

[tfs-changeset: 1658774]

Merge changes from TFS