am 1978baa1: am ec2d5674: Merge "Bump up clang vesion accepting __builtin_isnan __attribute__((pcs("aapcs")))"

* commit '1978baa1ae7b0a4b74030608cfc4fe71a64ffb55':
  Bump up clang vesion accepting __builtin_isnan __attribute__((pcs("aapcs")))