Linux/ARM: Support -O3 optimization level in release build (#5396)
Linux/ARM: Support -O3 optimization level in release build (#5396)

Currently, we can build coreclr with -O1 flag of clang in release
build mode for Linux/ARM. This instruction is to enable -O3 optimization
level of clang on ARM/Linux by fixing the bug of llvm.

Signed-off-by: Geunsik Lim <acd8f4539166019ed6425de5f67e6d834f46e5a4@samsung.com>
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