Note function entry points.

test/cmdlineTests/function_debug_info/input.sol

@@ -0,0 +1,11 @@
+pragma solidity >=0.0;
+// SPDX-License-Identifier: GPL-3.0
+contract C {
+    function f(uint[] calldata x) pure external returns (uint) { return x[0]; }
+    // This will be optimized out
+    function g() pure internal {}
+    mapping(uint => uint) public t;
+    constructor(uint x) {
+        t[0] = x;
+    }
+}