Implement basic support for merging function declarations across
translation units.

llvm-svn: 95794
diff --git a/clang/test/ASTMerge/Inputs/function2.c b/clang/test/ASTMerge/Inputs/function2.c
new file mode 100644
index 0000000..ad81c07
--- /dev/null
+++ b/clang/test/ASTMerge/Inputs/function2.c
@@ -0,0 +1,6 @@
+typedef int Int;
+void f0(Int);
+void f1(Int, double);
+void f2(int, int);
+void f3(int);
+static void f4(float, float);