Move InvSqrt2 to the front of inv_txfm2d_add_c

This will simplify the range management of rect txfm

Change-Id: Icf678fe735dd299c6c42a215c592611025e87ba6

test/av1_inv_txfm2d_test.cc

diff --git a/test/av1_inv_txfm2d_test.cc b/test/av1_inv_txfm2d_test.cc
index 9866eb5..6260424 100644
--- a/test/av1_inv_txfm2d_test.cc
+++ b/test/av1_inv_txfm2d_test.cc
@@ -169,7 +169,7 @@
 #if CONFIG_TX64X64
     if (tx_type == DCT_DCT) {  // Other types not supported by these tx sizes.
       param_list.push_back(AV1InvTxfm2dParam(tx_type, TX_32X64, 5, 0.38));
-      param_list.push_back(AV1InvTxfm2dParam(tx_type, TX_64X32, 5, 0.38));
+      param_list.push_back(AV1InvTxfm2dParam(tx_type, TX_64X32, 5, 0.39));
       param_list.push_back(AV1InvTxfm2dParam(tx_type, TX_16X64, 3, 0.38));
       param_list.push_back(AV1InvTxfm2dParam(tx_type, TX_64X16, 3, 0.38));
     }