[X86] Fix the lowering of setjmp intrinsic on i386.
When the lowering of the setjmp intrinsic requires
a global base pointer to be set, make sure such pointer
gets defined by the CGBR pass.

This fixes PR26742.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262762 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed