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Reland: [clang driver] Move default module cache from system temporary directory

Authored by davezarzycki on Jun 23 2020, 2:43 AM.

Description

Reland: [clang driver] Move default module cache from system temporary directory

This fixes a unit test. Otherwise here is the original commit:

  1. Shared writable directories like /tmp are a security problem.
  2. Systems provide dedicated cache directories these days anyway.
  3. This also refines LLVM's cache_directory() on Darwin platforms to use the Darwin per-user cache directory.

Reviewers: compnerd, aprantl, jakehehrlich, espindola, respindola, ilya-biryukov, pcc, sammccall

Reviewed By: compnerd, sammccall

Subscribers: hiraditya, llvm-commits, cfe-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D82362