[compiler-rt] add ppc64le target arch

[willschm]

Summary

When run on a ppc64le based platform, the check-sanitizer build looks for objects with the powerpc64le name. i.e. asan-powerpc64le.a
This change allows those objects to be built.

[samsonov]

LGTM

[willschm]

Closed by commit rL221356 (authored by @willschm).

compiler-rt/trunk/cmake/config-ix.cmake

 else()
   if("${LLVM_NATIVE_ARCH}" STREQUAL "X86")
     if (NOT MSVC)
       test_target_arch(x86_64 ${TARGET_64_BIT_CFLAGS})
     endif()
     test_target_arch(i386 ${TARGET_32_BIT_CFLAGS})
   elseif("${LLVM_NATIVE_ARCH}" STREQUAL "PowerPC")
     test_target_arch(powerpc64 ${TARGET_64_BIT_CFLAGS})
+    test_target_arch(powerpc64le ${TARGET_64_BIT_CFLAGS})
   elseif("${LLVM_NATIVE_ARCH}" STREQUAL "Mips")
     if("${COMPILER_RT_TEST_TARGET_ARCH}" MATCHES "mipsel|mips64el")
       # regex for mipsel, mips64el                                                                                                                                                                                 
       test_target_arch(mipsel ${TARGET_32_BIT_CFLAGS})
       test_target_arch(mips64el ${TARGET_64_BIT_CFLAGS})
     else()
       test_target_arch(mips ${TARGET_32_BIT_CFLAGS})
       test_target_arch(mips64 ${TARGET_64_BIT_CFLAGS})
if(NOT (ARCH_INDEX EQUAL -1) AND CAN_TARGET_${arch})
       list(APPEND archs ${arch})
     endif()
   endforeach()
   set(${out_var} ${archs} PARENT_SCOPE)
 endfunction()
 
 # Arhcitectures supported by compiler-rt libraries.
 filter_available_targets(SANITIZER_COMMON_SUPPORTED_ARCH
-  x86_64 i386 i686 powerpc64 arm aarch64 mips mips64 mipsel mips64el)
+  x86_64 i386 i686 powerpc64 powerpc64le arm aarch64 mips mips64 mipsel mips64el)
 filter_available_targets(ASAN_SUPPORTED_ARCH
-  x86_64 i386 i686 powerpc64 arm mips mipsel)
+  x86_64 i386 i686 powerpc64 powerpc64le arm mips mipsel)
 filter_available_targets(DFSAN_SUPPORTED_ARCH x86_64)
 filter_available_targets(LSAN_SUPPORTED_ARCH x86_64)
 # LSan common files should be available on all architectures supported
 # by other sanitizers (even if they build into dummy object files).
 filter_available_targets(LSAN_COMMON_SUPPORTED_ARCH
   ${SANITIZER_COMMON_SUPPORTED_ARCH})
 filter_available_targets(MSAN_SUPPORTED_ARCH x86_64)
 filter_available_targets(PROFILE_SUPPORTED_ARCH x86_64 i386 i686 arm mips mips64 mipsel mips64el aarch64)