[PATCH] Add a DIModule debug info metadata node to the IR.

[Adrian Prantl]

These four properties are certainly very specific to clang modules.
Since they need to get translated into custom DW_AT_LLVM_key("value") by the backend, we could implement a generic mechanism like:

  // assuming that DW_AT_LLVM_config_macros = DW_AT_lo_user = 0x2500
  !2 = !DIModule(scope: !0, name: "Module", stringAttrs: !{ i32 9472, !"-DNDEBUG", ...})

... which the backend then interprets as a list of DW_FORM_strp attributes.
But since we don't have named constants in the IR to make this more readable, I'm not convinced that this is preferable at the moment.


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http://reviews.llvm.org/D9614

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