ARM: fix memory leak, simplify WoA stack probing

This fixes the memory leak introduced with the initial addition of support for
WoA stack probing.  Now that the pseudo-instruction expansion can handle an
external symbol, use that to generate the load which simplifies the logic as
well as avoids the memory leak.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207737 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed