[MERGE chakra-core#5183 @Penguinwizzard] Fix typo in cleanup for poisoning code

Penguinwizzard · Penguinwizzard · commit af0de1c91f20 · 2018-05-17T12:06:20.000-07:00
Merge pull request chakra-core#5183 from Penguinwizzard:fixheadsegmenttolength Causes nullptr AVs, RS5 only.
diff --git a/lib/Backend/Lower.cpp b/lib/Backend/Lower.cpp
@@ -17042,7 +17042,7 @@ Lowerer::GenerateFastElemIIntIndexCommon(
             if (baseValueType.IsLikelyTypedArray())
             {
                 int lengthOffset;
-                lengthOffset = GetArrayOffsetOfHeadSegment(baseValueType);
+                lengthOffset = GetArrayOffsetOfLength(baseValueType);
                 headSegmentLengthOpnd = IR::IndirOpnd::New(arrayOpnd, lengthOffset, TyUint32, m_func);
                 autoReuseHeadSegmentLengthOpnd.Initialize(headSegmentLengthOpnd, m_func);
             }

Original file line number	Diff line number	Diff line change
`@@ -17042,7 +17042,7 @@ Lowerer::GenerateFastElemIIntIndexCommon(`
`17042`	`17042`	`if (baseValueType.IsLikelyTypedArray())`
`17043`	`17043`	`{`
`17044`	`17044`	`int lengthOffset;`
`17045`		`- lengthOffset = GetArrayOffsetOfHeadSegment(baseValueType);`
	`17045`	`+ lengthOffset = GetArrayOffsetOfLength(baseValueType);`
`17046`	`17046`	`headSegmentLengthOpnd = IR::IndirOpnd::New(arrayOpnd, lengthOffset, TyUint32, m_func);`
`17047`	`17047`	`autoReuseHeadSegmentLengthOpnd.Initialize(headSegmentLengthOpnd, m_func);`
`17048`	`17048`	`}`