JIT: better addressing mode for floating point on arm64 (#65468)

src/coreclr/jit/lower.cpp

@@ -5367,7 +5367,7 @@ bool Lowering::TryCreateAddrMode(GenTree* addr, bool isContainable, GenTree* par
 #ifdef TARGET_ARM64
     // Check if we can "contain" LEA(BFIZ) in order to extend 32bit index to 64bit as part of load/store.
     if ((index != nullptr) && index->OperIs(GT_BFIZ) && index->gtGetOp1()->OperIs(GT_CAST) &&
-        index->gtGetOp2()->IsCnsIntOrI() && varTypeIsIntegral(targetType))
+        index->gtGetOp2()->IsCnsIntOrI() && (varTypeIsIntegral(targetType) || varTypeIsFloating(targetType)))
     {
         // BFIZ node is a binary op where op1 is GT_CAST and op2 is GT_CNS_INT
         GenTreeCast* cast = index->gtGetOp1()->AsCast();

src/coreclr/jit/morph.cpp

@@ -5511,7 +5511,7 @@ GenTree* Compiler::fgMorphArrayIndex(GenTree* tree)
     // See https://github.com/dotnet/runtime/pull/61293#issuecomment-964146497
 
     // Use 2) form only for primitive types for now - it significantly reduced number of size regressions
-    if (!varTypeIsIntegral(elemTyp))
+    if (!varTypeIsIntegral(elemTyp) && !varTypeIsFloating(elemTyp))
     {
         groupArrayRefWithElemOffset = false;
     }