tree e16b3753c587ffff6ffeda2e04f35851de6f2d53
parent 70e82dc7a254054f0de491493489da162e63c364
author Manman Ren <mren@apple.com> 1363392669 +0000
committer Manman Ren <mren@apple.com> 1363392669 +0000

Exploit this-return of a callsite in a this-return function.

For constructors/desctructors that return 'this', if there exists a callsite
that returns 'this' and is immediately before the return instruction, make
sure we are using the return value from the callsite.

We don't need to keep 'this' alive through the callsite. It also enables
optimizations in the backend, such as tail call optimization.

rdar://12818789


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177211 91177308-0d34-0410-b5e6-96231b3b80d8