Merge pull request #6503 from ethereum/inlineAsm-yul

Inline asm yul

test/libsolidity/semanticTests/viaYul/simple_inline_asm.sol

@@ -0,0 +1,17 @@
+contract C {
+    function f() public pure returns (uint32 x) {
+        uint32 a;
+        uint32 b;
+        uint32 c;
+        assembly {
+            a := 1
+            b := 2
+            c := 3
+        }
+        x = a + b + c;
+    }
+}
+// ====
+// compileViaYul: true
+// ----
+// f() -> 6

test/libsolidity/semanticTests/viaYul/various_inline_asm.sol

@@ -0,0 +1,23 @@
+contract C {
+    function f() public pure returns (uint32 x) {
+        uint32 a;
+        uint32 b;
+        uint32 c;
+        assembly {
+            function myAwesomeFunction(param) -> returnMe {
+                let localVar := 10
+                returnMe := add(localVar, param)
+            }
+            let abc := sub(10, a)
+            let xyz := 20
+            a := abc
+            b := myAwesomeFunction(30)
+            c := xyz
+        }
+        x = a + b + c;
+    }
+}
+// ====
+// compileViaYul: true
+// ----
+// f() -> 70