[NFC][Sanitizer] Use correct WEAK annotation to make Windows work
[NFC][Sanitizer] Use correct WEAK annotation to make Windows work

The previous fix didn't work for Windows:
https://github.com/llvm/llvm-project/commit/52b751088b11547e0f4ef0589ebbe5e57752c68c

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@355052 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt