Move more parser tests to syntax tests

test/libsolidity/syntaxTests/parsing/while_loop.sol

@@ -0,0 +1,9 @@
+contract test {
+    function fun(uint256 a) {
+        while (true) { uint256 x = 1; break; continue; } x = 9;
+    }
+}
+// ----
+// Warning: (20-115): No visibility specified. Defaulting to "public". 
+// Warning: (33-42): Unused function parameter. Remove or comment out the variable name to silence this warning.
+// Warning: (20-115): Function state mutability can be restricted to pure