[Sanitizer] Revert some parts of r186109 related to mbstowcs-and-friends interceptors

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@186155 91177308-0d34-0410-b5e6-96231b3b80d8
[lsan] Increase the hardcoded limit on number of leaks.

We never expected to see so many leaks in the real world. Until we did.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@186157 91177308-0d34-0410-b5e6-96231b3b80d8
Completely revert all mbstowcs-and-friends changes from r186109. They were unintentional

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@186158 91177308-0d34-0410-b5e6-96231b3b80d8