[PPC] When restoring R30 (PIC base pointer), mark it as <def>

This happened on the PPC32/SVR4 path and was discovered when building
FreeBSD on PPC32. It was a typo-class error in the frame lowering code.

This fixes PR26519.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302183 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed