Modify the uninitialized field visitor to detect uninitialized use across the
fields in the class.  This allows a better checking of member intiailizers and
in class initializers in regards to initialization ordering.

For instance, this code will now produce warnings:

class A {
  int x;
  int y;
  A() : x(y) {}  // y is initialized after x, warn here
  A(int): y(x) {} // default initialization of leaves x uninitialized, warn here
};

Several test cases were updated with -Wno-uninitialized to silence this warning.

llvm-svn: 191068
diff --git a/clang/test/SemaCXX/cxx0x-class.cpp b/clang/test/SemaCXX/cxx0x-class.cpp
index 074591e..2b1338f 100644
--- a/clang/test/SemaCXX/cxx0x-class.cpp
+++ b/clang/test/SemaCXX/cxx0x-class.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wno-error=static-float-init %s 
+// RUN: %clang_cc1 -Wno-uninitialized -fsyntax-only -verify -std=c++11 -Wno-error=static-float-init %s 
 
 int vs = 0;