JIT: Expand unaligned address recognition for ARM32 (#92938)

The JIT has some backwards compatibility for accessing unaligned float
fields on ARM32. With physical promotion, we can end up with some new
patterns that we didn't handle. Expand the pattern matching to handle a
constant address unaligned address.

Fix #92382

src/coreclr/jit/morph.cpp

@@ -9889,18 +9889,18 @@ GenTree* Compiler::fgMorphFinalizeIndir(GenTreeIndir* indir)
     GenTree* addr = indir->Addr();
 
 #ifdef TARGET_ARM
-    GenTree* effAddr = addr->gtEffectiveVal(true);
-    // Check for a misalignment floating point indirection.
-    if (effAddr->OperIs(GT_ADD) && varTypeIsFloating(indir))
+    if (varTypeIsFloating(indir))
     {
-        GenTree* addOp2 = effAddr->gtGetOp2();
-        if (addOp2->IsCnsIntOrI())
+        // Check for a misaligned floating point indirection.
+        GenTree*       effAddr = addr->gtEffectiveVal(true);
+        target_ssize_t offset;
+        FieldSeq*      fldSeq;
+        gtPeelOffsets(&effAddr, &offset, &fldSeq);
+
+        if (((offset % genTypeSize(TYP_FLOAT)) != 0) ||
+            (effAddr->IsCnsIntOrI() && ((effAddr->AsIntConCommon()->IconValue() % genTypeSize(TYP_FLOAT)) != 0)))
         {
-            ssize_t offset = addOp2->AsIntCon()->IconValue();
-            if ((offset % genTypeSize(TYP_FLOAT)) != 0)
-            {
-                indir->gtFlags |= GTF_IND_UNALIGNED;
-            }
+            indir->gtFlags |= GTF_IND_UNALIGNED;
         }
     }
 #endif // TARGET_ARM