[docs] Add rtags to the external examples.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@176871 91177308-0d34-0410-b5e6-96231b3b80d8
Implemented formatting of rvalue references

Summary:
Handle "&&" usage as rvalue reference, added tests and fixed incorrect
tests that interfere with this feature.

http://llvm.org/bugs/show_bug.cgi?id=15051

Reviewers: djasper

Reviewed By: djasper

CC: cfe-commits, klimek

Differential Revision: http://llvm-reviews.chandlerc.com/D531

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@176874 91177308-0d34-0410-b5e6-96231b3b80d8
We already reported an error for

extern "C" {
  void test5_f() {
    extern int test5_b;
  }
}
static float test5_b;

This patch makes us report one for

extern "C" {
  void test6_f() {
    extern int test6_b;
  }
}
extern "C" {
  static float test6_b;
}

Not because we think the declaration would be extern C, but because of the rule:

An entity with C language linkage shall not be declared with the same name as an entity in global scope...

We were just not looking past the extern "C" to see if the decl was in global
scope.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@176875 91177308-0d34-0410-b5e6-96231b3b80d8