Include smmintrin.h only when TARGET_SIMD_X86 is set
smmintrin.h is #included in IntraPrediction.cpp when INTRA_TRANS_ENC_OPT is defined even if TARGET_SIMD_X86 is not set. This causes the compilation to fail in non-x86 environment.
smmintrin.h is #included in IntraPrediction.cpp when INTRA_TRANS_ENC_OPT is defined even if TARGET_SIMD_X86 is not set. This causes the compilation to fail in non-x86 environment.