Do not remove certain casts with contained operands (#74602)

On ARM64, we turn the "EQ(CAST<byte>(x), 0)" into "TEST_EQ(x, 0xFF)",
to avoid materializing the cast.

However, this breaks recognition of the "cb[n]z" idiom. If "x" ends
up in a register, that's ok - we're essentially exchanging relop for a
cast. If, however, it was contained, it is better to leave it alone:

```
-            ldr     w0, [fp,#0x18]
-            tst     w0, #255
-            bne     G_M25131_IG10
-                                               ;; size=12 bbWeight=1    PerfScore 3.50
+            ldrb    w0, [fp,#0x18]
+            cbnz    w0, G_M25131_IG10
+                                               ;; size=8 bbWeight=1    PerfScore 3.00
```

src/coreclr/jit/lower.cpp

@@ -2789,14 +2789,13 @@ GenTree* Lowering::OptimizeConstCompare(GenTree* cmp)
             // doing so would produce incorrect results (e.g. RSZ, RSH).
             //
             // The below list of handled opers is conservative but enough to handle the most common
-            // situations. In particular this include CALL, sometimes the JIT unnecessarily widens
-            // the result of bool returning calls.
+            // situations.
             //
             bool removeCast =
 #ifdef TARGET_ARM64
-                (op2Value == 0) && cmp->OperIs(GT_EQ, GT_NE, GT_GT) &&
+                (op2Value == 0) && cmp->OperIs(GT_EQ, GT_NE, GT_GT) && !castOp->isContained() &&
 #endif
-                (castOp->OperIs(GT_CALL, GT_LCL_VAR) || castOp->OperIs(GT_OR, GT_XOR, GT_AND)
+                (castOp->OperIs(GT_LCL_VAR, GT_CALL, GT_OR, GT_XOR, GT_AND)
 #ifdef TARGET_XARCH
                  || IsContainableMemoryOp(castOp)
 #endif