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[DebugInfo] IR/Bitcode changes for DISubprogram flags.

Authored by probinson on Nov 28 2018, 1:14 PM.

Description

[DebugInfo] IR/Bitcode changes for DISubprogram flags.

Packing the flags into one bitcode word will save effort in
adding new flags in the future.

Differential Revision: https://reviews.llvm.org/D54755

llvm-svn: 347806