Revert "[SimplifyCFG] Handle tail-sinking of more than 2 incoming branches"

This reverts commit r280217. r280216 caused buildbot failures - backing out the entire chain.

llvm-svn: 280233
diff --git a/llvm/test/MC/ARM/data-in-code.ll b/llvm/test/MC/ARM/data-in-code.ll
index c2194e9..10657a3 100644
--- a/llvm/test/MC/ARM/data-in-code.ll
+++ b/llvm/test/MC/ARM/data-in-code.ll
@@ -9,7 +9,7 @@
 ;; Ensure that if a jump table is generated that it has Mapping Symbols
 ;; marking the data-in-code region.
 
-define void @foo(i32* %ptr, i32 %b) nounwind ssp {
+define void @foo(i32* %ptr) nounwind ssp {
   %tmp = load i32, i32* %ptr, align 4
   switch i32 %tmp, label %exit [
     i32 0, label %bb0
@@ -18,7 +18,7 @@
     i32 3, label %bb3
   ]
 bb0:
-  store i32 %b, i32* %ptr, align 4
+  store i32 0, i32* %ptr, align 4
   br label %exit
 bb1:
   store i32 1, i32* %ptr, align 4