Allow multiple -arm-enable-ehabi and -arm-enable-ehabi-descriptors Clang adds -arm-enable-ehabi and -arm-enable-ehabi-descriptors unconditionally for Android. This may fail when user also specify "-mllvm -arm-enable-ehabi" or "-mllvm -arm-enable-ehabi-descriptors" in the command line. Fix to allow multiple occurrences. Change-Id: I3860b22abdd8481ebb3068d5d3156436e27c7a57