fix returning scalar values

```zig
export fn entry1() i32 {
    return bar();
}
```

```llvm
define i32 @entry1() #2 !dbg !35 {
Entry:
  %0 = call fastcc i32 @bar(), !dbg !39
  ret i32 %0, !dbg !41
}
```
b3a4ec1bd2Andrew Kelley committed on 6/11/2019, 8:04:04 PMparente1d14e7
2 files changedLine totals unavailable