Start fixing pr19147.

This makes the coff writer compute the correct symbol value for the test in
pr19147. The section is still incorrect, that will be fixed in a followup patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207728 91177308-0d34-0410-b5e6-96231b3b80d8
If necessary for indirect encodings, emit stubs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207730 91177308-0d34-0410-b5e6-96231b3b80d8
Speculatively roll back r207724-r207726, which are code cleanup changes and
appear to be breaking a bootstrapped build of compiler-rt.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207732 91177308-0d34-0410-b5e6-96231b3b80d8