Changes required for rustc/cargo to build for iOS targets#73903

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Absolucy wants to merge 6 commits intorust-lang:masterfrom Absolucy:ios-rustc

Commits on Jun 30, 2020

Changes required for rustc/cargo to build for iOS targets
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Only set the flag in LLVM builds.
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Don't break on iOS Simulator builds.
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Commits on Jul 1, 2020

Document the CMake defines.
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Also document iphoneos-version-min.
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Explicitly check for iOS/tvOS.
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