Update ICU to 58.1

source/common/ucnv_ext.cpp

Index: source/common/ucnv_ext.cpp
diff --git a/source/common/ucnv_ext.cpp b/source/common/ucnv_ext.cpp
index 5cd1ab6174737c535431e0bb25dcc4c7b84e4d38..f8605187240159d6c4c87db9abc4e1dfe53f35b4 100644
--- a/source/common/ucnv_ext.cpp
+++ b/source/common/ucnv_ext.cpp
@@ -1,7 +1,9 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*
 ******************************************************************************
 *
-*   Copyright (C) 2003-2013, International Business Machines
+*   Copyright (C) 2003-2016, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 ******************************************************************************
@@ -690,10 +692,13 @@ ucnv_extWriteFromU(UConverter *cnv, const int32_t *cx,
         switch(length) {
         case 3:
             *p++=(uint8_t)(value>>16);
-        case 2: /*fall through*/
+            U_FALLTHROUGH;
+        case 2:
             *p++=(uint8_t)(value>>8);
-        case 1: /*fall through*/
+            U_FALLTHROUGH;
+        case 1:
             *p++=(uint8_t)value;
+            U_FALLTHROUGH;
         default:
             break; /* will never occur */
         }
@@ -880,7 +885,7 @@ ucnv_extContinueMatchFromU(UConverter *cnv,
         } else {
             /* the match did not use all of preFromU[] - keep the rest for replay */
             int32_t length=cnv->preFromULength-match;
-            uprv_memmove(cnv->preFromU, cnv->preFromU+match, length*U_SIZEOF_UCHAR);
+            u_memmove(cnv->preFromU, cnv->preFromU+match, length);
             cnv->preFromULength=(int8_t)-length;
         }