[PATCH] [Analyzer] Implementation of UnaryPlusChecker

[Adam Schnitzer]

This patch is an implementation of the
proposed "different.UnaryPlusWithUnsigned", which I implemented
as "alpha.deadcode.UnaryPlusWithUnsigned".

It is implemented as a simple AST checker. However, it seems that unary '+'
is often removed from the AST
as dead code. So some of the basic test cases don't work.

This is my first (real) patch, so any feedback or criticism is appreciated.

Adam Schnitzer
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