Shoaib Meenai 26edb21c29 [runtimes] Add umbrella targets for runtimes
This will create e.g. a compiler-rt target that'll build compiler-rt for
all configured targets, similar to how the runtimes umbrella target
builds all the runtimes for all configured targets.

Differential Revision: https://reviews.llvm.org/D74458
2020-02-12 09:46:14 -08:00
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