Move function arguments and return values.

test/libyul/evmCodeTransform/stackReuse/reuse_too_deep_slot.yul

@@ -0,0 +1,110 @@
+{
+    let x := 7
+
+    let y1, y2, y3, y4, y5, y6, y7, y8, y9, y10, y11, y12, y13, y14, y15 := verbatim_0i_15o("\x60\x42") // the verbatim will show up as PUSH1 42
+
+    // last use of x - the slot of x will be marked as unused, but not popped, since it is not at the stack top
+    sstore(0,x)
+
+    // If the slot of x is blindly reused, this will fail.
+    let z1, z2 := verbatim_0i_2o("\x60\x43") // will show up as PUSH1 43
+
+    // prevent the z's from being popped immediately after their declaration above.
+    mstore(1, z1)
+    mstore(1, z2)
+
+    // use all y's to prevent them from being popped immediately after their declaration above
+    sstore(1, y1)
+    sstore(1, y2)
+    sstore(1, y3)
+    sstore(1, y4)
+    sstore(1, y5)
+    sstore(1, y6)
+    sstore(1, y7)
+    sstore(1, y8)
+    sstore(1, y9)
+    sstore(1, y10)
+    sstore(1, y11)
+    sstore(1, y12)
+    sstore(1, y13)
+    sstore(1, y14)
+    sstore(1, y15)
+}
+// ====
+// stackOptimization: true
+// ----
+// PUSH1 0x7
+// PUSH1 0x42
+// DUP16
+// PUSH1 0x0
+// SSTORE
+// PUSH1 0x43
+// DUP2
+// PUSH1 0x1
+// MSTORE
+// DUP1
+// PUSH1 0x1
+// MSTORE
+// POP
+// POP
+// DUP15
+// PUSH1 0x1
+// SSTORE
+// DUP14
+// PUSH1 0x1
+// SSTORE
+// DUP13
+// PUSH1 0x1
+// SSTORE
+// DUP12
+// PUSH1 0x1
+// SSTORE
+// DUP11
+// PUSH1 0x1
+// SSTORE
+// DUP10
+// PUSH1 0x1
+// SSTORE
+// DUP9
+// PUSH1 0x1
+// SSTORE
+// DUP8
+// PUSH1 0x1
+// SSTORE
+// DUP7
+// PUSH1 0x1
+// SSTORE
+// DUP6
+// PUSH1 0x1
+// SSTORE
+// DUP5
+// PUSH1 0x1
+// SSTORE
+// DUP4
+// PUSH1 0x1
+// SSTORE
+// DUP3
+// PUSH1 0x1
+// SSTORE
+// DUP2
+// PUSH1 0x1
+// SSTORE
+// DUP1
+// PUSH1 0x1
+// SSTORE
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP
+// POP