[LoopSimplifyCFG] Re-enable const branch folding by default

Known underlying bugs have been fixed, intensive fuzz testing did not
find any new problems. Re-enabling by default. Feel free to revert if
it causes any functional failures.

llvm-svn: 353911

llvm/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(false));
+                                       cl::init(true));
 
 STATISTIC(NumTerminatorsFolded,
           "Number of terminators folded to unconditional branches");