Speculatively harden the conversion logic. I have no idea if this will help the dragonegg builders, and no test case at this point, but this was one dimly plausible case I spotted by inspection. Hopefully will get a testcase from those bots soon-ish, and will tidy this up with proper testing.
Speculatively harden the conversion logic. I have no idea if this will
help the dragonegg builders, and no test case at this point, but this
was one dimly plausible case I spotted by inspection. Hopefully will get
a testcase from those bots soon-ish, and will tidy this up with proper
testing.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@165869 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,dslab-epfl/asap,chubbymaggie/asap,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,chubbymaggie/asap,apple/swift-llvm,chubbymaggie/asap,chubbymaggie/asap,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,chubbymaggie/asap,GPUOpen-Drivers/llvm,dslab-epfl/asap,llvm-mirror/llvm,dslab-epfl/asap,dslab-epfl/asap,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,chubbymaggie/asap,GPUOpen-Drivers/llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,dslab-epfl/asap,dslab-epfl/asap