Take advantage of simplifications enabled by folding all indirect acc…

…ess to locals (#79722)

* Simplify DefinesLocal

* Delete DefinesLocalAddr from VN

* Simplify fgPerNodeLocalVarLiveness

* Simplify fgRemoveDeadStore

* Simplify gtSetEvalOrder

* Simplify optComputeLoopSideEffectsOfBlock

* Bring back some folding in morph

Forward sub can bring in local address nodes
and not recognizing them pessimizes things

* Delete IsLocalAddrExpr

* Delete DefinesLocalAddr

* Delete IndirTransform::None

src/coreclr/jit/compiler.h

@@ -3058,7 +3058,7 @@ class Compiler
     // Check if this tree is a typeof()
     bool gtIsTypeof(GenTree* tree, CORINFO_CLASS_HANDLE* handle = nullptr);
 
-    GenTree* gtCallGetDefinedRetBufLclAddr(GenTreeCall* call);
+    GenTreeLclVarCommon* gtCallGetDefinedRetBufLclAddr(GenTreeCall* call);
 
 //-------------------------------------------------------------------------
 // Functions to display the trees

src/coreclr/jit/gcinfo.cpp

@@ -285,7 +285,7 @@ GCInfo::WriteBarrierForm GCInfo::gcIsWriteBarrierCandidate(GenTreeStoreInd* stor
 //
 GCInfo::WriteBarrierForm GCInfo::gcWriteBarrierFormFromTargetAddress(GenTree* tgtAddr)
 {
-    if (tgtAddr->IsLocalAddrExpr() != nullptr)
+    if (tgtAddr->OperIsLocalAddr())
     {
         // No need for a GC barrier when writing to a local variable.
         return GCInfo::WBF_NoBarrier;