[compiler-rt] [compiler-rt] Add weak defs for .*contiguous_container.* functions (PR #120376)

[Hans Wennborg via llvm-commits]

zmodem wrote:

> LLVM Buildbot has detected a new failure on builder `sanitizer-windows` running on `sanitizer-windows` while building `compiler-rt` at step 4 "annotate".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/107/builds/6270

This looks related, though. Container annotation-related tests hang on Windows. I'll prepare a revert.

https://github.com/llvm/llvm-project/pull/120376