feature request: nim's compilation option pragmas

[Timothee Cour via Digitalmars-d]

Could we support something similar to nim's compilation option pragmas [1]:

```
{.push checks: off.}
# compile this section without runtime checks as it is speed critical
# ... some code ...
{.pop.} # restore old settings
```

in D could look like:

```
pragma(push, "-noboundscheck -O -release");
// compile this section with specified flags as it's critical
pragma(pop);
```

[1] http://nim-lang.org/docs/manual.html#pragmas-compilation-option-pragmas
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