[PATCH] [ASTMatchers] Allow isImplicit on all Decls.

[Peter Collingbourne]

LGTM

The only comment I would make is that in principle the compiler could change the assumption you are making in the test case about the implicit assignment operator. But (1) that observation is equally true of the other test cases (2) it would be easy to fix, say by taking a member pointer reference to the assignment operator.

http://reviews.llvm.org/D3775