replace LeakSanitizerIsTurnedOffForTheCurrentProcess with __lsan_is_turned_off, but this time hide it under __has_feature(address_sanitizer); also include <sanitizer/lsan_interface.h>

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@199303 91177308-0d34-0410-b5e6-96231b3b80d8
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git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@199306 91177308-0d34-0410-b5e6-96231b3b80d8