Summary: x86 is not a valid arch for target triples, but x86_64 and i386 are.

Reviewers: rengolin, silvas

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D26960

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Reviewers: rengolin

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D10209


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Half the internet has wildly incorrect ideas about what LLVM is (in
particular, many get the impression that LLVM is some magical
cross-platform runtime), so saying "LLVM" near "cross-compilation" in a
user-facing doc might provoke confusion.

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