[clang-scan-deps] Add verbose mode
[clang-scan-deps] Add verbose mode

When running in the default mode we don't print anything other than actual output to stdout to make automated processing easier.

Differential Revision: https://reviews.llvm.org/D67522

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@372174 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang