Bitcode from build-self-4-mingw32

The buildbot build-self-4-mingw32 is failing with an assertion:

Assertion failed: (isStackEmpty() && "Stack not empty at end of basic block?"), function processBasicBlock, file /Users/buildslave/zorg/buildbot/smooshlab/slave/build-self-4-mingw32/llvm.src/lib/Target/X86/X86FloatingPoint.cpp, line 305.

Could anyone produce a bitcode file for that failure, please?