Changes

* Compiler upgrade to LLVM 11.1.

* Compiler upgrade to LLVM 11.1.

** Most notably, certain code now emits "ands" rather than "and; and; tst" + "bfxil" patterns are more commonly used.

** Most notably, certain code now emits "ands" rather than "and; and; tst" + "bfxil" patterns are more commonly used.

* C++ language upgrade to C++20 (or C++17, but less likely).

* C++ language upgrade to C++17.

** Slab heaps/object containers are now constinit, no longer constructed during .init_array.

** Slab heaps/object containers are now constant initialized, no longer constructed during .init_array.

* Initialize0 changes:

* Initialize0 changes:

** KernelLdr now sends back the initial process binary address in state.

** KernelLdr now sends back the initial process binary address in state.