[ARM] generate correct code for armv6-m XO big stack operations
The ARM backend codebase is dotted with places where armv6-m will generate
constant pools. Now that we can generate execute-only code for armv6-m, we need
to make sure we use the movs/lsls/adds/lsls/adds/lsls/adds pattern instead of
these.
Big stacks is one of the obvious places. In this patch we take care of two
sites:
1. take care of big stacks in prologue/epilogue
2. take care of save/tSTRspi nodes, which implicitly fixes
emitThumbRegPlusImmInReg which is used in several frame lowering fns
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D154233