[llvm] r214761 - Reapply "DebugInfo: Ensure that all debug location scope chains from instructions within a function, lead to the function itself."

[David Blaikie]

Hey Reid - I seem to recall last time we spoke it turned out you'd sent the
wrong .cpp file and now only had the IR for the reproduction?

Any way we could get the original source reproduction for this (reducing
debug test cases in IR is difficult)? I'd really like to move forward with
this change as it introduces some useful invariants (and violations of
those invariants most likely represent pretty clear bugs in LLVM's debug
info for inlined functions).

On Sat, Aug 9, 2014 at 8:59 AM, Reid Kleckner <rnk at google.com> wrote:

> On Fri, Aug 8, 2014 at 2:40 PM, David Blaikie <dblaikie at gmail.com> wrote:
>
>> On Wed, Aug 6, 2014 at 3:54 PM, Reid Kleckner <rnk at google.com> wrote:
>> > Here's an O0 .ll file that breaks llc if you run opt -O2 on it, but
>> passes
>> > if you run llc:
>> > $ llc t.ll  # succeeds
>> > $ opt -O2 t.ll -o - | llc -o t.s
>> > Assertion failed: DISubprogram(Scope).describes(MF->getFunction()), file
>> > ..\lib\CodeGen\LexicalScopes.cpp, line 179
>>
>> Haven't had any luck getting this to fail... any ideas? I can
>> side-by-side debug it with you next week, if it comes to that...
>
>
> Hm, try llc -mtriple=i686-windows-msvc?
>
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