[ARM] Fix handling of thumb1 out-of-range frame offsets

[ARM] Fix handling of thumb1 out-of-range frame offsets

LocalStackSlotPass assumes that isFrameOffsetLegal doesn't change its
answer when the base register changes. Unfortunately this isn't true
in thumb1, where SP-based loads allow a larger offset than
non-SP-based loads, and this causes the base register reuse code to
generate instructions that are unencodable, causing an assertion
failure.

Solve this by adding a BaseReg parameter to isFrameOffsetLegal, which
ARMBaseRegisterInfo can then make use of to give the correct answer.

Differential Revision: http://reviews.llvm.org/D8419

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232825 91177308-0d34-0410-b5e6-96231b3b80d8