[NFC] Introduce a `LateInitialize()` method to `SymbolizerTool` that is called...

[NFC] Introduce a `LateInitialize()` method to `SymbolizerTool` that is called during the LateInitialize stage of the sanitizer runtimes.

Summary:
This is implemented by adding a `Symbolizer::LateInitializeTools()`
method that iterates over the registered tools and calls the
`LateInitialize()` method on them.

`Symbolizer::LateInitializeTools()` is now called from the various
`Symbolizer::LateInitialize()` implementations.

The default implementation of `SymbolizerTool::LateInitialize()`
does nothing so this change should be NFC.

This change allows `SymbolizerTool` implementations to perform
any initialization that they need to perform at the
LateInitialize stage of a sanitizer runtime init.

rdar://problem/58789439

Reviewers: kubamracek, yln, vitalybuka, cryptoad, phosek, rnk

Subscribers: #sanitizers, llvm-commits

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D78178