Windows snapshot build v11 runs high on memory, sometimes out of memory

[llvmbot]

Bugzilla Link	45750
Version	trunk
OS	Windows NT
Reporter	LLVM Bugzilla Contributor
CC	@DougGregor,@zygoloid

Extended Description

First, please note this was only a problem seen with the Windows snapshot build v11 from:

https://llvm.org/builds/
LLVM-11.0.0-2663a25f-win64.exe

This is not a problem with v10 nor v9 from:

https://releases.llvm.org/download.html
LLVM-10.0.0-win64.exe
LLVM-9.0.0-win64.exe

I see that v10 (20 Mar 2020) is newer than v11 (3 February 2020), so the v11 page or build is outdated?
https://releases.llvm.org/

The problem I had, when building with clang from Visual Studio 2019, is it used a lot of memory (20gb+), sometimes ending with the LLVM out of memory error.

With v10 and v9, it runs below 1gb.

I can provide more details. But first worth considering the Windows snapshot page is replaced by the releases page?