[compiler-rt] support armv4t
The main thing that needed changing was excluding functionality that
isn't supported on armv4t. So excluding Arm specific builtin assembly files.
In the process some files were renamed and the source was annotated where
appropriate, so it's a bit easier to follow what group of files are meant for
what purpose.
Reviewed By: peter.smith, nickdesaulniers
Differential Revision: https://reviews.llvm.org/D138725
GitOrigin-RevId: aadec60ad9b81f00cf6fcdcbff61f1144d206769
3 files changed
