[clang][deps] Set -disable-free for module compilations

The command-line arguments for module builds are cc1 commands, so they
do not implicitly set -disable-free like a driver invocation, and
Tooling will disable it for the scanning instance itself. Set
-disable-free explicitly so that separate invocations for building
modules will not pay for freeing memory unnecessarily.

Differential Revision: https://reviews.llvm.org/D127229