Prevent ClangTools from generating dependency files.

D34304 created a way for ToolInvocations to conditionally generate
dependency files, and updated call sites to preserve the old behavior
of not generating them by default. CompilerInvocations...

Summary:
...are yet another
call-path that needs updating to preserve the old behavior.

Reviewers: klimek, echristo

Reviewed By: echristo

Subscribers: echristo, cfe-commits

Differential Revision: https://reviews.llvm.org/D35131

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@308043 91177308-0d34-0410-b5e6-96231b3b80d8