[Build Script Helper] Add an option that indicates the driver is being built for use with a local just-built frontend #537
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When used, we mostly just need to be aware that the build is in a single-target mode and to simplify where the build products are placed, so that they are easier to find from the compiler's
build-script
.This will be used from swift's
build-script
to always build an instance ofswift-driver
using a host toolchain, in order to patch theswift
build directory with the new driver.