4 day week.

[TCWG-614] Range Extension Thunks - Rebased due to upstream refactoring - Pinged but no upstream review progress

[Compiler-rt] Clang no longer always uses base PCS for all the builtins it expands such as the _Complex helpers. - Added tests to make sure RTABI 4.1.2 Floating Point helpers all use softfp in Clang D35538 and llvm D35904. - Reviewer pointed out useful script update_llc_test_checks.py that can simplify writing of llc tests. Well worth checking out

[LLD] Looks like lld use in Android may be becoming more likely, major blocking feature is lack of Cortex-A53 erratum fix 843419. - I've commented on the upstream PR https://bugs.llvm.org/show_bug.cgi?id=33463 - I've written some test cases and have started a prototype implementation

Submitted Linaro Connect presentation proposal for Functional Safety and Development tools.

Plans: In priority order: - range extension thunks - Cortex-A53 843419 - Compiler-rt