Use -O1 optimization for arm and armel
Use -O1 optimization for arm and armel

Because there are bugs for -O3 optimization in clang (<=3.8) for arm,
let's use -O1 instead of -O3 for a while.

Related github issue: https://github.com/dotnet/core-setup/issues/790

Signed-off-by: Hyung-Kyu Choi <b24f6a1d8ab6a697998e8a2c60eb031a02db5070@samsung.com>

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