The Linux build fix had broken the Mac build, so the new
"typeinfo" virtual function were moved from the header files
to the source files to fix both builds simultaneously.

Change-Id: I37f5ef4bd5ec4da34a19531dcb85df6a98728aa1
Reviewed-on: https://swiftshader-review.googlesource.com/8748Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>