Restructure the propagation of -fPIC/-fPIE.

The PIC and PIE levels are not independent. In fact, if PIE is defined
it is always the same as PIC.

This is clear in the driver where ParsePICArgs returns a PIC level and
a IsPIE boolean. Unfortunately that is currently lost and we pass two
redundant levels down the pipeline.

This patch keeps a bool and a PIC level all the way down to codegen.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@273566 91177308-0d34-0410-b5e6-96231b3b80d8