[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

llvm-svn: 288681

compiler-rt/cmake/config-ix.cmake

@@ -424,6 +424,7 @@ endif()
 
 find_program(GOLD_EXECUTABLE NAMES ${LLVM_DEFAULT_TARGET_TRIPLE}-ld.gold ld.gold ${LLVM_DEFAULT_TARGET_TRIPLE}-ld ld DOC "The gold linker")
 
+list(REMOVE_DUPLICATES COMPILER_RT_SUPPORTED_ARCH)
 message(STATUS "Compiler-RT supported architectures: ${COMPILER_RT_SUPPORTED_ARCH}")
 
 if(ANDROID)