[CodeGen] Don't assume that fixed stack objects are aligned in a stack-realigned function.
Summary:
After we make the adjustment, we can assume that for local allocas, but
not for stack parameters, the return address, or any other fixed stack
object (which has a negative offset and therefore lies prior to the
adjusted SP).
Fixes PR26662.
Reviewers: hfinkel, qcolombet, rnk
Subscribers: rnk, llvm-commits
Differential Revision: http://reviews.llvm.org/D18471
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265886
91177308-0d34-0410-b5e6-
96231b3b80d8