[Remarks][Driver] Ask for line tables when remarks are enabled

Serialized remarks contain debug locations for each remark, by storing a
file path, a line, and a column.

Also, remarks support being embedded in a .dSYM bundle using a separate
section in object files, that is found by `dsymutil` through the debug
map.

In order for tools to map addresses to source and display remarks in the
source, we need line tables, and in order for `dsymutil` to find the
object files containing the remark section, we need to keep the debug
map around.

Differential Revision: https://reviews.llvm.org/D71325