git: b4125f7d51da..e4bbddaec868 - vendor/llvm-project/release-12.x - vendor branch updated

[Dimitry Andric]

The branch vendor/llvm-project/release-12.x has been updated by dim:

URL: https://cgit.FreeBSD.org/src/log/?id=b4125f7d51da..e4bbddaec868

e4bbddaec868 Vendor import of llvm-project branch release/12.x llvmorg-12.0.1-rc2-0-ge7dac564cd0e, a.k.a. 12.0.1 rc2.