[PATCH] D150856: [lit] Add %{for-each-file} substitution

[Vlad Serebrennikov via Phabricator via llvm-commits]

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This substitution effectively duplicated enclosing RUN command for each file in the given path. Accepts wildcards.

In order to keep implementation simple, only a single such substitution per command is supported. It is possible to support multiple such substitution via cartesian product, if deemed necessary.

Use case for this is upcoming refactoring of C++ DR tests structure to avoid tests interfering with each other. Currently, tests are grouped by 100 per file, and have a RUN command per C++ Standard revision (for a total of 7 with the recent addition of `c++2c` mode). The plan is to rely heavily on `split-file` to invoke the compiler individually for each test, but avoid duplicating RUN commands for each of them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150856

Files:
  llvm/docs/CommandGuide/lit.rst
  llvm/docs/ReleaseNotes.rst
  llvm/utils/lit/lit/TestRunner.py

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