[WinEH] Verify unwind edges against EH pad tree

Summary:
Funclet EH personalities require a tree-like nesting among funclets
(enforced by the ParentPad linkage in the IR), and also require that
unwind edges conform to certain rules with respect to the tree:
 - An unwind edge may exit 0 or more ancestor pads
 - An unwind edge must enter exactly one EH pad, which must be distinct
   from any exited pads
 - A cleanupret's edge must exit its cleanuppad

Describe these rules in the LangRef, and enforce them in the verifier.


Reviewers: rnk, majnemer, andrew.w.kaylor

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D15961

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257272 91177308-0d34-0410-b5e6-96231b3b80d8

test/Bitcode/compatibility.ll

@@ -885,7 +885,8 @@ catchpad:
   ; CHECK-NEXT: br label %body
 
 body:
-  invoke void @f.ccc() to label %continue unwind label %terminate.inner
+  invoke void @f.ccc() [ "funclet"(token %catch) ]
+    to label %continue unwind label %terminate.inner
   catchret from %catch to label %return
   ; CHECK: catchret from %catch to label %return