Francis Visoiu Mistrih 1646851b87 [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

llvm-svn: 359041

2019-04-23 21:57:46 +00:00

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