ICU upgrade to 54.1 step 2

patches/col.patch

-Index: source/i18n/ucol.cpp
-===================================================================
---- source/i18n/ucol.cpp       (revision 292709)
-+++ source/i18n/ucol.cpp       (working copy)
-@@ -2259,6 +2259,9 @@ inline UChar getNextNormalizedChar(collIterate *data)
-         if (data->pos + 1 == data->endp) {
-             return *(data->pos ++);
-         }
-+        if (data->pos >= data->endp) {
-+            return (UChar) -1; // return U+FFFF (non-char) to indicate an error
-+        }
-     }
-     else {
-         if (innormbuf) {
-@@ -2820,8 +2823,14 @@ uint32_t ucol_prv_getSpecialCE(const UCollator *coll, UChar ch, uint32_t CE, col
-                                     goBackOne(source);
-                                 }
-                             }
--                        } else if (U16_IS_LEAD(schar)) {
--                            miss = U16_GET_SUPPLEMENTARY(schar, getNextNormalizedChar(source));
-+                        } else if (U16_IS_LEAD(schar) && source->pos + 1 < source->endp) {
-+                            const UChar* prevPos = source->pos;
-+                            UChar nextChar = getNextNormalizedChar(source);
-+                            if (U16_IS_TRAIL(nextChar)) {
-+                                miss = U16_GET_SUPPLEMENTARY(schar, nextChar);
-+                            } else if (prevPos < source->pos) {
-+                                goBackOne(source);
-+                            }
-                         }
- 
-                         uint8_t sCC;