[ARM] Fix PR35379 - incorrect unwind information when compiling with -Oz

The patch makes the unwind information not mention registers, which were pushed
solely for the purpose of saving stack adjustment instructions.

Differential revision: https://reviews.llvm.org/D41300
Fixes https://bugs.llvm.org/show_bug.cgi?id=35379



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321996 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed