[PATCH] Improve testing for the C API

[Amaury SECHET]

Updated the test to use diff.

I'd say i wouldn't be against writting part of this in C++ . Some of the C code is really ugly, but I wanted ot have something up and running fast enough.


http://reviews.llvm.org/D10725

Files:
  include/llvm-c/Core.h
  lib/IR/Core.cpp
  test/Bindings/llvm-c/echo.ll
  tools/llvm-c-test/CMakeLists.txt
  tools/llvm-c-test/calc.c
  tools/llvm-c-test/echo.c
  tools/llvm-c-test/llvm-c-test.h
  tools/llvm-c-test/main.c
  tools/llvm-c-test/metadata.c
  tools/llvm-c-test/module.c

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