[llvm-dev] Stop bugpoint from removing operand of metadata.

[Hongbin Zheng via llvm-dev]

Hi,

I am trying to use bugpoint to reduce testcase. And bugpoint try to reduce
the number of operands for metadata, and this generate corrupted metadata:

*** Attempting to remove named metadata: Checking for crash with only these
named metadata nodes: llvm.dbg.cu llvm.module.flags llvm.ident: <crash>
Checking for crash with only these named metadata nodes: llvm.module.flags
llvm.ident: <crash>
Checking for crash with only these named metadata nodes: llvm.ident:
Checking for crash with only these named metadata nodes: llvm.module.flags:
<crash>
Checking for crash with only 3 named metadata operands: <crash>
Checking for crash with only 2 named metadata operands: All DICompileUnits
must be listed in llvm.dbg.cu
LLVM ERROR: Broken module found, compilation aborted!


This crash bugpoint itself. Is there away to prevent bugpoint from doing
this rather than changing the source code of bugpoint?

I tried to run a "bugpoint --help-hidden" and get the following options
related to metadata:
    -lowertypetests                                        - Lower type
metadata
  -disable-namedmd-remove                                  - Do not remove
global named metadata
  -enable-import-metadata                                  - Enable import
metadata like 'thinlto_src_module'
  -enable-noalias-to-md-conversion                         - Convert
noalias attributes to metadata during inlining.
  -lto-strip-invalid-debug-info                            - Strip invalid
debug info metadata during LTO instead of aborting.

And I don't think these help.

Any suggestion?

Thanks
Hongbin
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