Make two icu fuzz targets more useful.

fuzzers/icu_break_iterator_utf32_fuzzer.cc

Index: fuzzers/icu_break_iterator_utf32_fuzzer.cc
diff --git a/fuzzers/icu_break_iterator_utf32_fuzzer.cc b/fuzzers/icu_break_iterator_utf32_fuzzer.cc
index ba66c0ac279148c9d9ac3adfbd48ecebdaa2a42c..cc840ed5c10144955cfb31460df0f4d6ac0111f1 100644
--- a/fuzzers/icu_break_iterator_utf32_fuzzer.cc
+++ b/fuzzers/icu_break_iterator_utf32_fuzzer.cc
@@ -37,6 +37,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   }
   if (U_FAILURE(status))
     return 0;
+  bi->setText(str);
 
   for (int32_t p = bi->first(); p != icu::BreakIterator::DONE; p = bi->next())
     if (U_FAILURE(status))