[llvm-bugs] [Bug 26573] New: R257164 Causing Segfault in Firebird and LibreOffice in "Combine redundant instructions" pass

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26573

            Bug ID: 26573
           Summary: R257164 Causing Segfault in Firebird and LibreOffice
                    in "Combine redundant instructions" pass
           Product: new-bugs
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: lukebenes at hotmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15879
  --> https://llvm.org/bugs/attachment.cgi?id=15879&action=edit
Firebird build log

I discovered this bug when I upgraded to 257311 using the official Ubuntu 14.04
nightly packages. After the upgrade, clang would crash in the "Combine
redundant instructions" pass. I was able to bisect this regression down to
257164 with my own builds of clang. 

Steps to reproduce:
1. $ git clone git://anongit.freedesktop.org/libreoffice/core
2. $ git checkout libreoffice-5-1 (optional, master fails with same errors)
3. $ apt-get build-dep libreoffice ( also lo_usefull Shell Script if missing
dep)
4. create file autogen.input with CC=clang and CXX=clang++
5 ./autogen.sh && make

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