[CGP] Look through bitcasts when duplicating returns for tail calls

[CGP] Look through bitcasts when duplicating returns for tail calls

The simple case of:

```
int *callee();
void *caller(void *a) {
  if (a == NULL)
    return callee();
  return a;
}
```

would generate a regular call instead of a tail call because we don't
look through the bitcast of the call to `callee` when duplicating the
return blocks.

Differential Revision: https://reviews.llvm.org/D60837

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@359041 91177308-0d34-0410-b5e6-96231b3b80d8