[LLVMdev] Request to push patches for PR17982 to release 3.4 branch

[Manman Ren]

This set of patches add support for debug info metadata version and debug
info metadata will be dropped if a loaded bit code has no version or an
outdated version.

195494: Debug Info: add a constant for debug info version number.
195495: Debug Info: add a "Debug Info Version" module flag to output the
current debug info version number.
195504: Debug Info: update testing cases to specify the debug info version
number.
195505: Debug Info: move StripDebugInfo from StripSymbols.cpp to
DebugInfo.cpp.
195535: Debug Info: update testing cases to specify the debug info version
number.
196143: Expand comments for Debug Info Version.
196144: Debug Info: Move the constant for Debug Info Version from Dwarf.h
to Metadata.h.
196145: Debug Info: Move the constant for Debug Info Version from Dwarf.h
to Metadata.h.
196156: Update Ocaml/vmcore.ml to emit a "Debug Info Version" module flag.
196157(dragonegg): Debug info metadata without a version or with an
outdated version will be dropped. Add a version here to avoid that.
 196158: Debug Info: drop debug info via upgrading path if version number
does not match.
 196172: Debug Info: rename getDebugInfoVersionFromModule to
getDebugMetadataVersionFromModule.

Thanks a lot,
Manman
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