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[gn build] Add build files for llvm/lib/Target/PowerPC + tests

Authored by thakis on Jan 8 2019, 7:16 AM.

Description

[gn build] Add build files for llvm/lib/Target/PowerPC + tests

The PowerPC target itself is similar to the X86 target in https://reviews.llvm.org/rL348903
The llvm-exegesis unittests bits are similar to the corresponding AArch64 in https://reviews.llvm.org/rL350499
The whole patch is very similar to the WebAssembly target being added in https://reviews.llvm.org/rL350628

Also add a dep from tools/llvm-exegesis/lib to the AArch64 subdir, which I
failed to do in r350499.

The motivation for this target is solely that it has a unit test and I want to
enable the GN<->CMake unittest syncing check for llvm.

Differential Revision: https://reviews.llvm.org/D56416

llvm-svn: 350629