[llvm] [bolt] Introduce binary analysis tool based on BOLT. (PR #115330)

[Kristof Beyls via llvm-commits]

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+# BOLT-based binary analysis
+
+As part of post-link-time optimizing, BOLT needs to perform a range of analyses
+on binaries such as recontructing control flow graphs, and more.
+
+The `llvm-bolt-binary-analysis` tool enables running requested binary analyses
+on binaries, and generating reports. It does this by building on top of the
+analyses implementing in the BOLT libraries.
+
+## Which binary analyses are implemented?
+
+At the moment, no binary analyses are implemented.
+
+The goal is to make it easy using a plug-in framework to add you own analyses.
+
+## How to add your own binary analysis
+
+_TODO: this section needs to be written. Ideally, we should have an simple
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kbeyls wrote:

nit: "an simple" -> "a simple"

https://github.com/llvm/llvm-project/pull/115330