Fix building for iOS

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@211751 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/Unwind/UnwindRegistersRestore.S b/src/Unwind/UnwindRegistersRestore.S
index 1feb1d5..362a5b0 100644
--- a/src/Unwind/UnwindRegistersRestore.S
+++ b/src/Unwind/UnwindRegistersRestore.S
@@ -308,7 +308,7 @@
   ldp    x0, x1,  [x0, #0x000]  ; restore x0,x1
   ret    lr            ; jump to pc
 
-#elif __arm__
+#elif __arm__ && !__APPLE__
 
 @
 @ void libunwind::Registers_arm::restoreCoreAndJumpTo()