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Add gdb pretty printers for a wide variety of libc++ data structures (take 2).

Description

Add gdb pretty printers for a wide variety of libc++ data structures (take 2).

Summary:
This patch is an exact duplicate of https://reviews.llvm.org/D65609, except
that it uses the newly introduced testing framework to detect if gdb is present
so that the tests won't fail on machines without gdb.

Reviewers: echristo, EricWF

Subscribers: christof, ldionne, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67238

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