[ASan] Fix https://code.google.com/p/address-sanitizer/issues/detail?id=321 for time() and frexp()
Add a test for the frexp() interceptor.
Annotate the interceptors that may potentially corrupt stack IDs of freed buffers with FIXME comments.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@211153 91177308-0d34-0410-b5e6-96231b3b80d8