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dd0b826235
Rather than just on or off, I've changed it to allow "off", "fast", or "full". "fast" means that we'll do symbol lookup, but we won't try to find inline frames and we won't run line number programs (those are the things that are taking considerable time in some cases). rdar://122302117
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.