tree 80d8fb18d2ea4b1ca367957f9c745f1fef79d059
parent 2f6ad55a3bfa16867146233e1eb8b822b1daab4b
author Aart Bik <ajcbik@google.com> 1457469745 -0800
committer Aart Bik <ajcbik@google.com> 1457469745 -0800

Implement the 1.8 unsafe memory fences directly in HIR.

Rationale:
More efficient since it exposes full semantics to
all operations on the graph and allows for proper
code generation for all architectures.

bug=26264765

Change-Id: Ic435886cf0645927a101a8502f0623fa573989ff