Semantic tests for compilation via Yul.

test/libsolidity/semanticTests/viaYul/function_entry_checks.sol

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+contract C {
+    function f() public returns (uint) {
+    }
+    function g(uint x, uint y) public returns (uint) {
+    }
+    function h() public payable returns (uint) {
+    }
+    function i(bytes32 b) public returns (bytes32) {
+    }
+    function j(bool b) public returns (bool) {
+    }
+    function k(bytes32 b) public returns (bytes32) {
+    }
+    function s() public returns (uint256[] memory) {
+    }
+    function t(uint) public pure {
+    }
+}
+// ===
+// compileViaYul: true
+// ----
+// f() -> 0
+// g(uint256,uint256): 1, -2 -> 0
+// h(), 1 ether -> 0
+// i(bytes32), 1 ether: 2 -> FAILURE
+// i(bytes32): 2 -> 0
+// j(bool): true -> false
+// k(bytes32): 0x31 -> 0x00
+// s(): hex"4200ef" -> 0x20, 0
+// t(uint256) -> FAILURE

test/libsolidity/semanticTests/viaYul/smoke_test.sol

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+contract C {
+}
+// ====
+// compileViaYul: true
+// ----
+// f() -> FAILURE