Fix check for same type

[wmtan]

This pull request fixes a bug in CMS ROOT6 specific code. The function TypeWithDict::pointerToBase() compared two types for equality by comparing the TypeWithDict pointers. This is a bug, because there can easily be more than one TypeWithDict object for the same type.
The fix is to compare the std::type_info (instead of TypeWithDict) for each of the two types, first by comparing the pointers, and, if the pointers are unequal, comparing the std::type_info's by value.
This fixes one framework unit test that was failing in the ROOT6 branch.

[cmsbuild]

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

Fix check for same type

It involves the following packages:

FWCore/Utilities

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