This patch adds the bare-minimum tests for the LLDB `llvm::ArrayRef` formatters. Since this would be the first LLVM data fromatter test for LLDB, I wanted to keep the test itself minimal and mainly set up/agree on the infrastructure (i.e., CMake machinery, etc.). The setup mimicks that of GDB. The main differences are: 1. the GDB formatter tests put all the test cases in one monolithic test file, whereas I'm planning on having one test-file per LLVM container. 2. the GDB formatter tests currently only get run if LLVM was built with debug-info. Not sure we have any build-bots out there running this configuration. In this patch we rely on just the debug-info from the LLVM headers (see latest commit). That way the tests get more consistently run (at least our public macOS buildbot runs the cross-project-tests in Release+Asserts).
PACKAGE_VERSION is not overwritten when doing find_package(gRPC) (#173115)
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