Remove a bogus assert so we don't crash in

namespace {
  struct X {};
}
extern "C" {
  X b = X();
}

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176866 91177308-0d34-0410-b5e6-96231b3b80d8
Error if an extern C declaration matches a previous hidden extern C declaration.

Without this patch we produce an error for

extern "C" {
  void f() {
    extern int b;
  }
}
extern "C" {
  extern float b;
}

but not for

extern "C" {
  void f() {
    extern int b;
  }
}
extern "C" {
  float b;
}

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176867 91177308-0d34-0410-b5e6-96231b3b80d8
Correctly compute linkage of decls forward declared extern C.

This fixes a crash in

namespace {
  struct X {};
}
extern "C" X test2_b;
X test2_b

before we would assign different linkages to each of the test2_b decls.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176869 91177308-0d34-0410-b5e6-96231b3b80d8
Modify comment in user test.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176870 91177308-0d34-0410-b5e6-96231b3b80d8