[llvm] DeveloperPolicy: Update commit access requirements (PR #127006)

[Tom Stellard via llvm-commits]

================
@@ -539,11 +539,21 @@ What are the expectations around a revert?
 Obtaining Commit Access
 -----------------------
 
-We grant commit access to contributors that can provide a valid justification.
-If you would like commit access, please use this `link <https://github.com/llvm/llvm-project/issues/new?title=Request%20Commit%20Access%20For%20%3Cuser%3E&body=%23%23%23%20Why%20Are%20you%20requesting%20commit%20access%20?>`_ to file
+Once you have 3 or more merged pull requests, you may use this
+link <https://github.com/llvm/llvm-project/issues/new?title=Request%20Commit%20Access%20For%20%3Cuser%3E&body=%23%23%23%20Why%20Are%20you%20requesting%20commit%20access%20?>`_ to file
 an issue and request commit access. Replace the <user> string in the title
 with your github username, and explain why you are requesting commit access in
-the issue description. If approved, a GitHub invitation will be sent to your
+the issue description.  Once the issue is created, you will need to get two
+current contributors to support your request before commit access will be granted.
+
+Reviewers of your committed patches will automatically be CCed upon creating the issue.
+Most commonly these reviewers will provide the necessary approval, but approvals
----------------
tstellar wrote:

@jayfoad You can just leave a comment say " I support this request" or something similar.

https://github.com/llvm/llvm-project/pull/127006