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[FIX] Forces shrink wrapping to consider any memory access as aliasing with the…

Authored by dnsampaio on Jun 13 2019, 6:56 AM.

Description

[FIX] Forces shrink wrapping to consider any memory access as aliasing with the stack

Summary:
Relate bug: https://bugs.llvm.org/show_bug.cgi?id=37472

The shrink wrapping pass prematurally restores the stack, at a point where the stack might still be accessed.
Taking an exception can cause the stack to be corrupted.

As a first approach, this patch is overly conservative, assuming that any instruction that may load or store could access
the stack.

Reviewers: dmgreen, qcolombet

Reviewed By: qcolombet

Subscribers: simpal01, efriedma, eli.friedman, javed.absar, llvm-commits, eugenis, chill, carwil, thegameg

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63152

llvm-svn: 363265