tree f7fcbe874f083bdfc1f814a7dcf438200072cc85
parent e614f166bb3e789f37ea24d0de743658ce85165c
author Taiju Tsuiki <tzik@google.com> 1529383147 +0000
committer Taiju Tsuiki <tzik@google.com> 1529383147 +0000

Update NRVO logic to support early return (Attempt 2)

Summary:
This is the second attempt of r333500 (Update NRVO logic to support early return).
The previous one was reverted for a miscompilation for an incorrect NRVO set up on templates such as:
```
struct Foo {};

template <typename T>
T bar() {
  T t;
  if (false)
    return T();
  return t;
}
```

Where, `t` is marked as non-NRVO variable before its instantiation. However, while its instantiation, it's left an NRVO candidate, turned into an NRVO variable later.

Reviewers: rsmith

Reviewed By: rsmith

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D47586

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@335019 91177308-0d34-0410-b5e6-96231b3b80d8