move passing stage1 compile error tests to stage2

test/cases/compile_errors/missing_else_clause.zig

@@ -0,0 +1,16 @@
+fn f(b: bool) void {
+    const x : i32 = if (b) h: { break :h 1; };
+    _ = x;
+}
+fn g(b: bool) void {
+    const y = if (b) h: { break :h @as(i32, 1); };
+    _ = y;
+}
+export fn entry() void { f(true); g(true); }
+
+// error
+// backend=stage2
+// target=native
+//
+// :2:21: error: incompatible types: 'i32' and 'void'
+// :6:15: error: incompatible types: 'i32' and 'void'