[clang][darwin] Add support for the -mtargetos= option to the driver #3133
+118
−19
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The new -mtargetos= option is a replacement for the existing, OS-specific options
like -miphoneos-version-min=. This allows us to introduce support for new darwin OSes
easier as they won't require the use of a new option. The older options will be
deprecated and the use of the new option will be encouraged instead.
Differential Revision: https://reviews.llvm.org/D106316
(cherry picked from commit f575f37)