Bug ID: 30431
           Summary: error in backend: assembler label
                    L?xxx$parent_frame_offset can not be undefined (MSVC,
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
    Classification: Unclassified

While compiling my source tree under LLVM-4.0.0-r281648-win64.exe and MSVC
2015, the following compilation error happens for debug builds:

CL : fatal error : error in backend: assembler label
'L?query_cpu_feature_set@pfc@@YA_NI@Z$parent_frame_offset' can not be undefined

This does not happen in release builds. This happens in previous versions of
LLVM/Clang too.

To reproduce, open a VS2015 x86 Native Tools command prompt and run:

git clone --recursive
cd columns_ui
msbuild /m /p:PlatformToolset=LLVM-vs2014 /p:Platform=Win32
/p:Configuration=Debug /t:Rebuild vc14\columns_ui-public.sln

The problematic function is defined here:

Removing the usage of SEH makes the problem go away. Release builds also work.

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