StrictEquals fastpath

- Handle Neq case in TryGenerateFastCmSrXx
- While generating fastpath IsConstRegOpnd was checking IsSingleDef, change it to value type check to check for undefined/null/boolean
- Fast path for when one of the sources has a definite value type
- Changed helper path to include fast paths for objects which are not GlobalObject, HotDispatch or External

Author: Meghana Gupta

lib/Backend/IR.cpp

@@ -2842,7 +2842,7 @@ Instr::IsByteCodeUsesInstrFor(IR::Instr * instr) const
 IR::LabelInstr *
 Instr::GetOrCreateContinueLabel(const bool isHelper)
 {
-    if(m_next && m_next->IsLabelInstr() && m_next->AsLabelInstr()->isOpHelper == isHelper)
+    if (m_next && m_next->IsLabelInstr() && m_next->AsLabelInstr()->isOpHelper == isHelper)
     {
         return m_next->AsLabelInstr();
     }