Partial revert of r7396

This change reverts a small part of what was done in r7396. It seems
like that change uncovered another issue with NEON.

BUG=4177,chrome-os-partner:31534
R=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/33849004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@8043 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/codecs/isac/fix/source/fft.c b/webrtc/modules/audio_coding/codecs/isac/fix/source/fft.c
index a1876d0..08701b2 100644
--- a/webrtc/modules/audio_coding/codecs/isac/fix/source/fft.c
+++ b/webrtc/modules/audio_coding/codecs/isac/fix/source/fft.c
@@ -176,8 +176,10 @@
       bjQx = ImxQx[k1] + ImxQx[k2];
       RexQx[kk] = akQx + ajQx;
       ImxQx[kk] = bkQx + bjQx;
-      akQx -= ajQx >> 1;
-      bkQx -= bjQx >> 1;
+      tmp116 = ajQx >> 1;
+      tmp216 = bjQx >> 1;
+      akQx = akQx - tmp116;
+      bkQx = bkQx - tmp216;
       tmp116 = RexQx[k1] - RexQx[k2];
       tmp216 = ImxQx[k1] - ImxQx[k2];