Summary:
Codegen and tests for thread-local storage.
This implements only the general dynamic model due to limitations in nld 2.26.
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D74718
Summary: Support for PIC with tests for global variables and function calls.
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D74536