[ASan/Win] Remove old, unused and non-functional code that will be re-written soon

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@215707 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan/Win] Remove a hack that seems not to be required with VS2013 anymore

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@215708 91177308-0d34-0410-b5e6-96231b3b80d8