Revert r351520, "Re-enable terminator folding in LoopSimplifyCFG"

This is still causing compilation crashes in some targets. Will follow up shortly with a repro.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351845 91177308-0d34-0410-b5e6-96231b3b80d8

Author: rupprecht

lib/Transforms/Scalar/LoopSimplifyCFG.cpp

@@ -41,7 +41,7 @@ using namespace llvm;
 #define DEBUG_TYPE "loop-simplifycfg"
 
 static cl::opt<bool> EnableTermFolding("enable-loop-simplifycfg-term-folding",
-                                       cl::init(true));
+                                       cl::init(false));
 
 STATISTIC(NumTerminatorsFolded,
           "Number of terminators folded to unconditional branches");