Update ICU to 58.1

source/i18n/decimfmtimpl.cpp

Index: source/i18n/decimfmtimpl.cpp
diff --git a/source/i18n/decimfmtimpl.cpp b/source/i18n/decimfmtimpl.cpp
index 8493ecd03772f54748094433f81d084b6e94a519..1bf742d148c60529e3e26feb7af6a12abca7af75 100644
--- a/source/i18n/decimfmtimpl.cpp
+++ b/source/i18n/decimfmtimpl.cpp
@@ -1,3 +1,5 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
 /*
  * Copyright (C) 2015, International Business Machines
  * Corporation and others.  All Rights Reserved.
@@ -241,9 +243,9 @@ DecimalFormatImpl::setMultiplierScale(int32_t scale) {
     if (scale == 0) {
         // Needed to preserve equality. fMultiplier == 0 means
         // multiplier is 1.
-        fMultiplier.set(0);
+        fMultiplier.set((int32_t)0);
     } else {
-        fMultiplier.set(1);
+        fMultiplier.set((int32_t)1);
         fMultiplier.shiftDecimalRight(scale);
     }
 }
@@ -425,7 +427,7 @@ DecimalFormatImpl::format(
 
 UnicodeString &
 DecimalFormatImpl::format(
-        const StringPiece &number,
+        StringPiece number,
         UnicodeString &appendTo,
         FieldPositionIterator *posIter,
         UErrorCode &status) const {
@@ -706,7 +708,7 @@ DecimalFormatImpl::getMultiplier() const {
 void
 DecimalFormatImpl::setMultiplier(int32_t m) {
     if (m == 0 || m == 1) {
-        fMultiplier.set(0);
+        fMultiplier.set((int32_t)0);
     } else {
         fMultiplier.set(m);
     }
@@ -1481,7 +1483,7 @@ DecimalFormatImpl::toNumberPattern(
             }
         } else {
             if (i < roundingIncrementUpperExp && i >= roundingIncrementLowerExp) {
-                result.append(fEffPrecision.fMantissa.fRoundingIncrement.getDigitByExponent(i) + kPatternZeroDigit);
+                result.append((UChar)(fEffPrecision.fMantissa.fRoundingIncrement.getDigitByExponent(i) + kPatternZeroDigit));
             } else if (minInterval.contains(i)) {
                 result.append(kPatternZeroDigit);
             } else {