[MERGE #5783 @meg-gupta] StrictEquals fastpath

Merge pull request #5783 from meg-gupta:sefastpath

- 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, HostDispatch or External

Author: Meghana Gupta

lib/Backend/GlobOpt.cpp

@@ -6512,7 +6512,7 @@ GlobOpt::GetConstantVar(IR::Opnd *opnd, Value *val)
         else if (valueInfo->IsFloat())
         {
             IR::Instr * defInstr = opnd->AsRegOpnd()->m_sym->GetInstrDef();
-            if (defInstr->m_opcode == Js::OpCode::LdC_F8_R8 && defInstr->GetSrc1()->IsFloatConstOpnd())
+            if ((defInstr->m_opcode == Js::OpCode::LdC_F8_R8 || defInstr->m_opcode == Js::OpCode::LdC_A_R8) && defInstr->GetSrc1()->IsFloatConstOpnd())
             {
                 return Js::JavascriptNumber::ToVar(defInstr->GetSrc1()->AsFloatConstOpnd()->m_value);
             }

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();
     }