Add -scanner-prefix-map-paths to the frontend
#82745
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sina-mahdavi
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tshortli,
hborla,
slavapestov and
xedin
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The current command-line option for specifying prefix mappings for the dependency scanner does not handle paths containing equal signs. This PR adds a new option
-scanner-prefix-map-pathsthat has a multiArg format instead of being=-separated and fixes this issue. The old-scanner-prefix-mapoption is still preserved, but is made driver-only and gets translated to the new option format by the driver.Corresponding PR on Swift-Driver: swiftlang/swift-driver#1949