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[CMake] Support cross-compiling with Fuchsia toolchain build

Authored by phosek on Nov 15 2018, 8:50 PM.

Description

[CMake] Support cross-compiling with Fuchsia toolchain build

When second stage is being cross-compiled for a different platform
we need to build enough of first stage runtimes to get a working
compiler.

Differential Revision: https://reviews.llvm.org/D54463

llvm-svn: 347026

Details