[clang] [clang-format] Google Style: disable DerivePointerAlignment. (PR #149602)

[Owen Pan via cfe-commits]

owenca wrote:

> > Can you add a link to the relevant section of the style guide?
> 
> The new policy is not yet published, but I added a link to the section which will be changed.

This patch looks good now, but IMO we should wait until the new style is published.

https://github.com/llvm/llvm-project/pull/149602