Un-XFAIL JIT EH tests under [am]san.

These tests started passing after libcxxabi's r255559, which fixed a problem
relating to how libcxxabi links its EH library. The test failures were
caused by an issue with libc++, not the sanitizers (confirmed by building a
pre-r255559 revision with libc++/libc++abi and without sanitizers), so they
should never have been XFAILed under the sanitizers.

llvm-svn: 255708
diff --git a/llvm/test/ExecutionEngine/MCJIT/eh.ll b/llvm/test/ExecutionEngine/MCJIT/eh.ll
index b301b64..ed057e1 100644
--- a/llvm/test/ExecutionEngine/MCJIT/eh.ll
+++ b/llvm/test/ExecutionEngine/MCJIT/eh.ll
@@ -1,5 +1,5 @@
 ; RUN: %lli %s
-; XFAIL: arm, cygwin, win32, mingw, asan, msan
+; XFAIL: arm, cygwin, win32, mingw
 declare i8* @__cxa_allocate_exception(i64)
 declare void @__cxa_throw(i8*, i8*, i8*)
 declare i32 @__gxx_personality_v0(...)