Shrinkify Thumb2 load / store multiple instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78717 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMConstantIslandPass.cpp b/lib/Target/ARM/ARMConstantIslandPass.cpp
index d88d5e7..1491569 100644
--- a/lib/Target/ARM/ARMConstantIslandPass.cpp
+++ b/lib/Target/ARM/ARMConstantIslandPass.cpp
@@ -1333,7 +1333,8 @@
 }
 
 /// UndoLRSpillRestore - Remove Thumb push / pop instructions that only spills
-/// LR / restores LR to pc.
+/// LR / restores LR to pc. FIXME: This is done here because it's only possible
+/// to do this if tBfar is not used.
 bool ARMConstantIslands::UndoLRSpillRestore() {
   bool MadeChange = false;
   for (unsigned i = 0, e = PushPopMIs.size(); i != e; ++i) {