[PCH] Pull the location out of the serialized declarations and put it in the array
of decl bit offsets.

This allows us to easily get at the location of a decl without deserializing it.
It increases size of Cocoa PCH by only 0.2%.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143123 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed