James Y Knight 4772b99dff Clang Driver: refactor support for writing response files to be ...

specified at Command creation, rather than as part of the Tool.

This resolves the hack I just added to allow Darwin toolchain to vary
its level of support based on `-mlinker-version=`.

The change preserves the _current_ settings for response-file support.
Some tools look likely to be declaring that they don't support
response files in error, however I kept them as-is in order for this
change to be a simple refactoring.

Differential Revision: https://reviews.llvm.org/D82782

2020-06-29 18:27:02 -04:00

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