Use the linker to perform probe relocations instead of doing fixups in
drti.o.

This solves a whole host of problems with the previous approach.
Revert "Merge branch '20140903-drti-mangled-fixup' into markj-develop"

This reverts commit 2ee6ceaadc03f00372afe09d5c2167d2780ca7a0, reversing
changes made to 5a9bc5c25a491b28be3e2954473bf9aff888490f.
Merge branch '20140907-dtrace-probe-relocation' into markj-develop