[PATCH] D122569: [lit] Support %if ... %else syntax for RUN lines

[Andrew Savonichev via Phabricator via llvm-commits]

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This syntax allows to modify RUN lines based on features
available. For example:

  RUN: ... | FileCheck %s --check-prefix={%if windows {W} else {NON-W}}
  CHECK-W: ...
  CHECK-NON-W: ...

The whole command can be put under %if ... %else:

  RUN: %if tool_available { %tool } else { true }

Multi-line expressions are also supported:

  RUN: %if tool_available { \
  RUN:   %tool              \
  RUN: } else {             \
  RUN:   true               \
  RUN: }

Background and motivation:
D121727 <https://reviews.llvm.org/D121727> [NVPTX] Integrate ptxas to LIT tests
https://reviews.llvm.org/D121727


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122569

Files:
  llvm/docs/TestingGuide.rst
  llvm/utils/lit/lit/TestRunner.py
  llvm/utils/lit/tests/Inputs/shtest-if-else/lit.cfg
  llvm/utils/lit/tests/Inputs/shtest-if-else/test.txt
  llvm/utils/lit/tests/shtest-if-else.py

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