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highbd_inv_txfm_sse4: make << of neg. val a multiply

left shifting a negative value is undefined; quiets a ubsan warning.
this is applied to a constant, no change in the generated code.

Change-Id: I595f0ff7904ef025e07bb80234293d958dc9f254

--- a/vpx_dsp/x86/highbd_inv_txfm_sse4.h

+++ b/vpx_dsp/x86/highbd_inv_txfm_sse4.h

@@ -18,7 +18,7 @@

 static INLINE __m128i multiplication_round_shift_sse4_1(

     const __m128i *const in /*in[2]*/, const int c) {

-  const __m128i pair_c = pair_set_epi32(c << 2, 0);

+  const __m128i pair_c = pair_set_epi32(c * 4, 0);

   __m128i t0, t1;

   t0 = _mm_mul_epi32(in[0], pair_c);