[LLVMbugs] [Bug 22782] New: Add bitcode abbreviations for commonly used debug info nodes

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22782

            Bug ID: 22782
           Summary: Add bitcode abbreviations for commonly used debug info
                    nodes
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Bitcode Writer
          Assignee: unassignedbugs at nondot.org
          Reporter: dexonsmith at apple.com
                CC: aprantl at apple.com, dblaikie at gmail.com,
                    echristo at gmail.com, friss at apple.com,
                    llvmbugs at cs.uiuc.edu
    Classification: Unclassified

While adding specialized nodes for bug 22464, I only wrote explicit
abbreviations for a couple types of nodes.

I imagine we can do better than this.  At the very least the field for
'isDistinct()' can be shrunk to a single bit.  It may not be worth the
complexity for nodes that are rarely occurring, but we should at least
investigate the impact on bitcode size.

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