[MERGE #5671 @sigatrev] enable IsIn optimization for addrOpnds

Merge pull request #5671 from sigatrev:isInAddr

numeric literal copy proped to var opnds are handled as addrOpnds. This change allows handling of addr opnds for the IsIn optimization, allowing us to optimize ```if (0 in array) ...```.

Author: sigatrev

lib/Backend/GlobOptArrays.cpp

@@ -151,6 +151,16 @@ bool GlobOpt::ArraySrcOpt::CheckOpCode()
                 return false;
             }
 
+            if (instr->GetSrc1()->IsAddrOpnd())
+            {
+                const Js::Var val = instr->GetSrc1()->AsAddrOpnd()->m_address;
+                if (Js::TaggedInt::Is(val))
+                {
+                    originalIndexOpnd = instr->UnlinkSrc1();
+                    instr->SetSrc1(IR::IntConstOpnd::New(Js::TaggedInt::ToInt32(val), TyInt32, instr->m_func));
+                }
+            }
+
             if (!instr->GetSrc1()->IsRegOpnd() && !instr->GetSrc1()->IsIntConstOpnd())
             {
                 return false;
@@ -199,7 +209,7 @@ void GlobOpt::ArraySrcOpt::TypeSpecIndex()
         {
             // If the optimization is unable to eliminate the bounds checks, we need to restore the original var sym.
             Assert(originalIndexOpnd == nullptr);
-            originalIndexOpnd = instr->GetSrc1()->Copy(func)->AsRegOpnd();
+            originalIndexOpnd = instr->GetSrc1()->Copy(func);
             globOpt->ToTypeSpecIndex(instr, instr->GetSrc1()->AsRegOpnd(), nullptr);
         }
     }

lib/Backend/GlobOptArrays.h

@@ -52,7 +52,7 @@ class GlobOpt::ArraySrcOpt
     IR::IndirOpnd * baseOwnerIndir = nullptr;
     IR::RegOpnd * baseOpnd = nullptr;
     IR::Opnd * indexOpnd = nullptr;
-    IR::RegOpnd * originalIndexOpnd = nullptr;
+    IR::Opnd * originalIndexOpnd = nullptr;
     bool isProfilableLdElem = false;
     bool isProfilableStElem = false;
     bool isLoad = false;