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We want to be able to efficiently serialise lists of images, and to do so it makes most sense to create a separate `ImageMap` type. This also provides a useful place to put methods to e.g. find an image by address or by build ID. rdar://124913332
What is this? ============= The libexec directory contains the source code for auxiliary executables that ship with the Swift runtime, as opposed to being part of the toolchain. On UNIX-like platforms, if the runtime is installed in /usr/lib/swift (for instance), these are things that you would expect to find in /usr/libexec/swift.