Author: Viktor Bezditnyi <v.bezditnyi@samsung.com>
Date:   Nov 22 2017

    Enabled -O3 optimization for QC x64 [CERT-1987]

    When polly vectorization disabled (-mllvm -polly-vectorizer=none)
    segfault appears during compilation for aarch64 for Qualcomm llvm
    3.9.6

    If polly vectorization enabled, compilation hangs on
    ./src/crypto/ec/p224-64.c
    Issuer in function 'bin28_to_felem'
    Therefore, use -polly-opt-level=none for ec routines

    Change-Id: If158ffd8baa25002c26b5fe0cba79fa27d2509f2