Revert "Emit column debug information for loads"

This broke the following gdb tests:

gdb.base__annota1.exp
gdb.base__consecutive.exp
gdb.python__py-symtab.exp
gdb.reverse__consecutive-precsave.exp
gdb.reverse__consecutive-reverse.exp

I will look into this.

This reverts commit 214162.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@214163 91177308-0d34-0410-b5e6-96231b3b80d8