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partial_idct_test: set MinSupportedCoeff for NEON

vpx_idct4x4_16_add_neon fails with INT16_MIN, +1 is all right

BUG=webm:1335

Change-Id: I25830c8ab0782822fc3c9db6cc669c2e65f2700e

--- a/test/partial_idct_test.cc

+++ b/test/partial_idct_test.cc

@@ -49,14 +49,18 @@

 }

 int16_t MinSupportedCoeff(InvTxfmFunc a) {

-#if HAVE_SSSE3 && ARCH_X86_64 && !CONFIG_VP9_HIGHBITDEPTH && \

-    !CONFIG_EMULATE_HARDWARE

+  (void)a;

+#if !CONFIG_EMULATE_HARDWARE

+#if HAVE_SSSE3 && ARCH_X86_64 && !CONFIG_VP9_HIGHBITDEPTH

   if (a == vpx_idct8x8_64_add_ssse3 || a == vpx_idct8x8_12_add_ssse3) {

     return -23625 + 1;

   }

-#else

-  (void)a;

+#elif HAVE_NEON

+  if (a == vpx_idct4x4_16_add_neon) {

+    return INT16_MIN + 1;

+  }

 #endif

+#endif  // !CONFIG_EMULATE_HARDWARE

   return INT16_MIN;

 }