Akira Hatanaka e8c1a54c07 [ObjCARC] Do not move a release that has the clang.imprecise_release tag ...

above PHI instructions.

ARC optimizer has an optimization that moves a call to an ObjC runtime
function above a phi instruction when the phi has a null operand and is
an argument passed to the function call. This optimization should not
kick in when the runtime function is an objc_release that releases an
object with precise lifetime semantics.

rdar://problem/34959669

llvm-svn: 315914

2017-10-16 16:46:59 +00:00

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