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Clang Driver: refactor support for writing response files to be specified at Command creation, rather than as part of the Tool.

Authored by jyknight on Jun 29 2020, 9:04 AM.



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.

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