The ability to use vector initializer lists is a GNU vector extension

and is unrelated to the NEON intrinsics in arm_neon.h. On little
endian machines it works fine, however on big endian machines it
exhibits surprising behaviour:

    uint32x2_t x = {42, 64};
    return vget_lane_u32(x, 0); // Will return 64.

Because of this, explicitly call out that it is unsupported on big
endian machines.

This patch will emit the following warning in big-endian mode:

    test.c:3:15: warning: vector initializers are a GNU extension and are not compatible with NEON intrinsics [-Wgnu]
    int32x4_t x = {0, 1, 2, 3};
                  ^
    test.c:3:15: note: consider using vld1q_s32() to initialize a vector from memory, or vcombine_s32(vcreate_s32(), vcreate_s32()) to initialize from integer constants
    1 warning generated.

llvm-svn: 211362

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