Add support for LdFld/StFld/InitFld/InlineeEnd in PathDepBranchFolding

Run it in prepass

Author: Meghana Gupta

RegenAllByteCodeNoBuild.cmd

@@ -28,4 +28,8 @@ setlocal
     call GenByteCode.cmd
     call GenByteCode.cmd -nojit
   popd
+  pushd %_reporoot%\lib\Runtime\Library\JsBuiltIn
+    call GenByteCode.cmd
+    call GenByteCode.cmd -nojit
+  popd
 endlocal

lib/Backend/BackwardPass.cpp

@@ -1144,10 +1144,6 @@ BackwardPass::MergeSuccBlocksInfo(BasicBlock * block)
         }
     }
     block->upwardExposedUses = upwardExposedUses;
-    if (this->tag == Js::BackwardPhase)
-    {
-        block->successorBlockUses = upwardExposedUses ? upwardExposedUses->CopyNew(this->globOpt->alloc) : nullptr;
-    }
     block->upwardExposedFields = upwardExposedFields;
     block->typesNeedingKnownObjectLayout = typesNeedingKnownObjectLayout;
     block->byteCodeUpwardExposedUsed = byteCodeUpwardExposedUsed;