Eric Christopher 6647b83087 Add a new wrapper node for a DILexicalBlock that encapsulates it and a ...

file. Since it should only be used when necessary propagate it through
the backend code generation and tweak testcases accordingly.

This helps with code like in clang's test/CodeGen/debug-info-line.c where
we have multiple #line directives within a single lexical block and want
to generate only a single block that contains each file change.

Part of rdar://10246360

llvm-svn: 141729

2011-10-11 22:59:11 +00:00

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