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vpx_idct32x32_34_add_sse2: rm unneeded transposes

this change is neutral to mildly positive across various x86-64
platforms

Change-Id: I28fb5ae598fc1317b7a42c9a846ac5d57d104784

--- a/vpx_dsp/x86/inv_txfm_sse2.c

+++ b/vpx_dsp/x86/inv_txfm_sse2.c

@@ -3066,17 +3066,7 @@

   in[6] = load_input_data(input + 192);

   in[7] = load_input_data(input + 224);

-  for (i = 8; i < 32; ++i) {

-    in[i] = _mm_setzero_si128();

-  }

-

   array_transpose_8x8(in, in);

-  // TODO(hkuang): Following transposes are unnecessary. But remove them will

-  // lead to performance drop on some devices.

-  array_transpose_8x8(in + 8, in + 8);

-  array_transpose_8x8(in + 16, in + 16);

-  array_transpose_8x8(in + 24, in + 24);

-

   IDCT32_34

   // 1_D: Store 32 intermediate results for each 8x32 block.