Attempt to load dictionary for class

[wmtan]

This is a ROOT6 specific bug fix that allows two more framework unit tests to pass.
If an attempt is made to construct a TypeWithDict from a class name, and the dictionary for the class has not yet been loaded, a default TypeWithDict is constructed, rather than one for the class in question.
The fix calls TClass::GetClass for the class name, which will load the dictionary if RootAutoLibraryLoader is in use.
Then, the proper TypeWithDict can be constructed instead of a default one.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_0_ROOT6_X.

Attempt to load dictionary for class

It involves the following packages:

FWCore/Utilities

@cmsbuild, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
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