1b5fae9118
Seen several beginner questions popping up in discourse about how to implement and run custom passes. And then it turns out that they are following the old "Writing an LLVM Pass" guide that describe legacy passes, and then things are mixed up when they try to run that pass using opt that nowadays default to the new pass manager. This is an attempt to make it slightly clearer in the User Guides that there are two different "Writing an LLVM Pass" pages depending on which pass manager that should be used. This is done by renaming the legacy version of "Writing an LLVM Pass" as "Writing an LLVM Pass (legacy PM version)". Also reordered the links to put the link to the new pass manager documentation first. This patch also moves the warning text that cross references the description on how to write a pass for legacy/new PM to make sure it ends up already in the beginning of the descriptions. Also adding a new warning in the "Running a pass with opt" section of the legacy PM version of the guide, to inform that those examples are outdated.
The LLVM Compiler Infrastructure
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