[clang] [PATCH 1/4] [clang] Improve nested name specifier AST representation (PR #147835)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

Given the scale of the patch, it's not surprising if it undergoes some revert-reapplies cycles after the initial commit.

To reduce the churn, would it be possible to ask google to test it internally before we merge? @AaronBallman 

https://github.com/llvm/llvm-project/pull/147835