Move loop cloning code (#52325)

Move it out of optimizer.cpp and into the pre-existing loopcloning.cpp, where many loop cloning helper classes already existed. No code changes, just code movement.
dotnet · May 5, 2021 · a56a142 · a56a142
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diff --git a/src/coreclr/jit/compiler.hpp b/src/coreclr/jit/compiler.hpp
@@ -3556,24 +3556,6 @@ inline bool Compiler::LoopDsc::lpArrLenLimit(Compiler* comp, ArrIndex* index) co
     return false;
 }
 
-/*****************************************************************************
- *  Is "var" assigned in the loop "lnum" ?
- */
-
-inline bool Compiler::optIsVarAssgLoop(unsigned lnum, unsigned var)
-{
-    assert(lnum < optLoopCount);
-    if (var < lclMAX_ALLSET_TRACKED)
-    {
-        ALLVARSET_TP vs(AllVarSetOps::MakeSingleton(this, var));
-        return optIsSetAssgLoop(lnum, vs) != 0;
-    }
-    else
-    {
-        return optIsVarAssigned(optLoopTable[lnum].lpHead->bbNext, optLoopTable[lnum].lpBottom, nullptr, var);
-    }
-}
-
 /*
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