Further improve optimization for nested calls.

Fake parentheses (i.e. emulated parentheses used to correctly handle
binary expressions) used to prevent the optimization implemented in
r180264.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181692 91177308-0d34-0410-b5e6-96231b3b80d8
Implements UseTab for clang-format.

This is required for kernel linux kernel style formatting.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181693 91177308-0d34-0410-b5e6-96231b3b80d8