so that you don't have to link Error.o and all of its dependencies.
In more detail: global initializers in Error.o can't be elided with
-ffunction-sections/-gc-sections since they always need to be run
causing a fairly significant binary bloat if all you want is the
ABI breaking checks code.
Differential Revision: https://reviews.llvm.org/D67387
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371561 91177308-0d34-0410-b5e6-96231b3b80d8
