[llvm-dwp] Initial partial prototype

This just concatenates the common DWP sections without doing any of the
fancy DWP things like:

1) update str_offsets
2) deduplicating strings
3) merging/creating cu/tu_index

Patches for these will follow shortly.

(also not sure about target triple/object file type for this tool - do I
really need a whole triple just to write an object file that contains
purely static/hardcoded bytes in each section? & I guess I should just
pick it based on the first input, maybe, rather than hardcoding for now
- but we only produce .dwo on ELF platforms with objcopy for now anyway)

llvm-svn: 254355

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-dwp/Inputs/simple/a.cpp b/llvm/test/tools/llvm-dwp/Inputs/simple/a.cpp
new file mode 100644
index 00000000000..f85d105a99f
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/simple/a.cpp
@@ -0,0 +1,2 @@
+struct foo { };
+foo a;