llvmGen: Don't pass stack alignment via command line

Closed Ben Gamari requested to merge wip/T23870 into master

As of https://reviews.llvm.org/D103048 LLVM no longer supports the -stack-alignment=... flag. Instead this information is passed via a module flag metadata node.

This requires dropping support for LLVM 11 and 12.

Fixes #23870 (closed)

Edited by Ben Gamari

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