Move the C++ toolchain into its own execution group so that it does not have to be bound by the same constraints as the execution platform selected for the Swift toolchain.#1586

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bj/move-the-c-toolchain-into-its-own-execution-group-so-that-it-does-not-have-to-be-bound-by-the-same-constraints-as-the-execution-platform-selected-for-the-swift-toolchainbazelbuild/rules_swift:bj/move-the-c-toolchain-into-its-own-execution-group-so-that-it-does-not-have-to-be-bound-by-the-same-constraints-as-the-execution-platform-selected-for-the-swift-toolchainCopy head branch name to clipboard