[asan]: fix a CHECK failure in use-after-return mode; enable and fix stack-use-after-return.cc; add a test for UAR mode in asan_noinst_test 

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@189457 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Remove extra backup/restore calls.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@189461 91177308-0d34-0410-b5e6-96231b3b80d8