Mark 2 libcore tests as failing.

bug:25136848
Change-Id: If1cde2f3a0140a5eb9c138a462ecc9a30e73b8eb
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index 7ada189..b4f686f 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -157,5 +157,12 @@
   modes: [device],
   names: ["libcore.java.util.TimeZoneTest#testAllDisplayNames"],
   bug: 22786792
+},
+{
+  description: "Formatting failures",
+  result: EXEC_FAILED,
+  names: ["libcore.java.text.NumberFormatTest#test_currencyFromLocale",
+          "libcore.java.text.NumberFormatTest#test_currencyWithPatternDigits"],
+  bug: 25136848
 }
 ]