[MERGE #5142 @meg-gupta] Enable PathDependentBranchFolding in prepass, handle LdFld/StFld/InitFld

Merge pull request #5142 from meg-gupta:pathDepInPre

- We can enable PathDependentBranchFolding in prepass safely. In prepass we can always trust the localValueTable we construct traversing the path, and we can trust the global valueTable when it is safe to do so.
- Additional support for LdFld/StFld/InitFld is added to the value table.
- A single InlineeEnd is supported to be skipped in the path for now.

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;