[LLVMdev] [Debug Info PATCH] for support of ref_addr and removal of DIE duplication

[Manman Ren]

Hi All,

The first patch adds support for ref_addr.
Most of it is from r176882, but instead of always using an integer for
ref_addr, we use label + offset for relocation on non-darwin platforms.

The second patch is a modified version of r191792.
The main change is to use a single map instead of 3 maps in DwarfDebug and
instead of calling DwarfDebug::getDIE|insertDIE directly, we delegate the
function calls to DwarfDebug from CompileUnit.

No testing case is added in the 1st patch, since the compiler does not use
ref_addr yet.

For the 2nd patch, testing cases are updated to make sure we remove
duplicated DIEs and use ref_addr to refer to the type DIE. A testing case
is also added to make sure we generate a relocation entry for ref_addr on
linux platform.

Thanks,
Manman
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