llvm dev - Nov 2018 - Any LLVM bitcode converter to downgrade bitcode across main versions

Hi mailing list,

Is there any tool available for downgrading LLVM bitcode to a lower version
(such as LLVM 3.x -> LLVM 2.x)? I need to use a symbolic execution tool
(supporting only LLVM 2.7) to analyze a code base that contains some c++11
features. But I am facing some problem: I can use clang 1.1 to generate
LLVM 2.7 but clang 1.1 does not support c+11; using a newer version of
clang that supports c++11 (such as clang 3.3) will only generate LLVM
bitcode of version newer than LLVM 2.7.
So I am wondering if any LLVM pass or tool exists in the LLVM community for
converting LLVM 3.3 bitcode to LLVM 2.7 bitcode. I found some discussion (
http://lists.llvm.org/pipermail/llvm-dev/2016-August/103389.html) of
LLVM bc converter for downgrading bitcode, but seems like it only supports
downgrading within one main version (such as 3.x).

Thanks,
David
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