clang-tidy altera-id-dependent-backward-branch: print notes after warning

In Clang notes are typically printed after a corresponding warning, not before.
For example, all notes issued before the first warning are ignored.

Running `clang-tidy --checks=-*,altera-id-dependent-backward-branch a.cpp` on the following code:
```
long get_local_id(int);
void error() {
  int ThreadID = get_local_id(0);
  for (int i = 0; i < ThreadID; i++) {
  }
  for (int i = 0; i < ThreadID; i++) {
  }
}
```
results in two warnings and a single note in between.

Reviewed By: carlosgalvezp

Differential Revision: https://reviews.llvm.org/D145303