[Orc] Tweak lambda capture lists to try to avoid an ICE on gcc-4.7.2. NFC.

[Orc] Tweak lambda capture lists to try to avoid an ICE on gcc-4.7.2. NFC.

Apparently gcc-4.7.2 is touchy about 'this' appearing in a lambda capture list
along with other captures. I've rewritten my captures to try to avoid the issue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228567 91177308-0d34-0410-b5e6-96231b3b80d8