[compiler-rt] Remove duplicates from COMPILER_RT_SUPPORTED_ARCH
[compiler-rt] Remove duplicates from COMPILER_RT_SUPPORTED_ARCH

Since we’re adding an entry into COMPILER_RT_SUPPORTED_ARCH for all architectures of all Darwin platforms, COMPILER_RT_SUPPORTED_ARCH often ends up having duplicate items. Let’s remove them.

Differential Revision: https://reviews.llvm.org/D25996



git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@288681 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt