[PATCH] Implement `internal_start/join_thread` on Mac OS X

[Alexey Samsonov]

================
Comment at: lib/sanitizer_common/sanitizer_mac.cc:359
@@ +358,3 @@
+void *internal_start_thread(void(*func)(void *arg), void *arg) {
+#if TARGET_OS_MAC && !TARGET_OS_IPHONE && !TARGET_IPHONE_SIMULATOR
+  // Start the thread with signals blocked, otherwise it can steal user signals.
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Please use SANITIZER_MAC, SANITIZER_IOSSIM and SANITIZER_IOS instead.

http://reviews.llvm.org/D9638

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