mips: XFAIL llvm-cov test

XFAIL llvm-cov.test for MIPS until big-endian issues are fixed for llvm-cov.
The test does pass on MIPS little-endian.

llvm-svn: 195966
diff --git a/llvm/test/tools/llvm-cov/llvm-cov.test b/llvm/test/tools/llvm-cov/llvm-cov.test
index d95af9b..39f112e 100644
--- a/llvm/test/tools/llvm-cov/llvm-cov.test
+++ b/llvm/test/tools/llvm-cov/llvm-cov.test
@@ -9,4 +9,4 @@
 
 RUN: not llvm-cov -gcno=test.gcno -gcda=test_checksum_mismatch.gcda
 
-XFAIL: powerpc64, s390x
+XFAIL: powerpc64, s390x, mips