Added support to the ASTImporter for C++ constructor initializers.
Also added named casts and propagation of "implicit" to fix the LLDB testsuite.
This is a fixed commit of r269546, which was reverted by r269575.

Thanks to Aleksei Sidorin for review and advice.

llvm-svn: 269693
diff --git a/clang/test/ASTMerge/Inputs/init-ctors-classes.cpp b/clang/test/ASTMerge/Inputs/init-ctors-classes.cpp
new file mode 100644
index 0000000..fd51f86
--- /dev/null
+++ b/clang/test/ASTMerge/Inputs/init-ctors-classes.cpp
@@ -0,0 +1,19 @@
+class A_base
+{
+public:
+  int x;
+  A_base() : x(0) {
+  }
+  A_base(int _x) : x(static_cast<int>(_x)) {
+  }
+};
+
+class A : public A_base
+{
+public:
+  int y;
+  struct { int z; };
+  int array[2];
+  A(int _x) : A_base(_x), y(0), z(1), array{{2},{3}} {
+  }
+};