[lit] Move the recursiveExpansionLimit setting to TestingConfig

The LitConfig is shared across the whole test suite. However, since
enabling recursive expansion can be a breaking change for some tes

[lit] Move the recursiveExpansionLimit setting to TestingConfig

The LitConfig is shared across the whole test suite. However, since
enabling recursive expansion can be a breaking change for some test
suites, it's important to confine the setting to test suites that
enable it explicitly.

Note that other issues were raised with the way recursiveExpansionLimit
operates. However, this commit simply moves the setting to the right
place -- the mechanism by which it works can be improved independently.

Differential Revision: https://reviews.llvm.org/D77415

show more ...

[lit] Recursively expand substitutions

This allows defining substitutions in terms of other substitutions. For
example, a %build substitution could be defined in terms of a %cxx
substitution as '%cx

[lit] Recursively expand substitutions

This allows defining substitutions in terms of other substitutions. For
example, a %build substitution could be defined in terms of a %cxx
substitution as '%cxx %s -o %t.exe' and the script would be properly
expanded.

Differential Revision: https://reviews.llvm.org/D76178

show more ...