[Flang][Driver] Support for -fsplit-lto-unit option in flang driver (#202858) When mixing Fortran objects from Flang with C/C++ objects compiled by Clang during a combined LTO build, it is necessary to ensure that all files use the same setting for split-lto-unit. This requires the support for -fsplit-lto-unit option in the flang driver. This support is added as part of this commit. Co-authored-by: Shivarama Rao <shivarama.rao@amd.com>
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