RFR: Fix compilation errors due to missing spaces between string literal and macro

[Aleksey Shipilev]

On 10/04/2018 04:27 PM, Zhengyu Gu wrote:
> Fix build errors, e.g.
> shenandoahHeapRegion.cpp:507:10: error: C++11 requires a space between string literal and macro
> [-Werror=c++11-compat]
> 
> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/string_literal/webrev.00/index.html

Looks good!

Thanks,
-Aleksey