Link to the correct bug number about the Mac failure for instrprof-shared-gcov-flush.test.
-# This test fails on Mac, powerpc64 BE (https://bugs.llvm.org/show_bug.cgi?id=38121).
+# This test fails on Mac (https://bugs.llvm.org/show_bug.cgi?id=38134) and powerpc64 BE (https://bugs.llvm.org/show_bug.cgi?id=38121).
XFAIL: darwin || powerpc64-unknown-linux-gnu
RUN: mkdir -p %t.d
