Updated the release notes for the changes in the DIModule metadata.
Reviewed By: aprantl
Differential Revision: https://reviews.llvm.org/D80614
behavior was undocumented. To preserve optimizations, frontends may need to
be updated to generate appropriate `align` attributes and metadata.
+* The DIModule metadata is extended to contain file and line number
+ information. This information is used to represent Fortran modules debug
+ info at IR level.
+
Changes to building LLVM
------------------------