[clang] [clang-tools-extra] Remove clang-pseudo (PR #109154)

[Erich Keane via cfe-commits]

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@@ -43,6 +43,8 @@ infrastructure are described first, followed by tool-specific sections.
 Major New Features
 ------------------
 
+- The ``clang-pseudo`` tool has been removed.
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erichkeane wrote:

A link to the RFC might be nice here, lets folks see the WHY.

https://github.com/llvm/llvm-project/pull/109154