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Reland "[CMake][libunwind] Use -nodefaultlibs for CMake checks"

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Reland "[CMake][libunwind] Use -nodefaultlibs for CMake checks"

This is a reland of commit r299796.

Turned out that we need gcc_s or compiler-rt on ARM when checking
the support for -funwind-tables which creates a dependency on
__aeabi_unwind_cpp_pr0 symbol that's provided by the compiler
runtime.

Differential Revision: https://reviews.llvm.org/D31858

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Committed
phosekApr 11 2017, 7:28 PM
Differential Revision
D31858: Reland "[CMake][libunwind] Use -nodefaultlibs for CMake checks"
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