RFR: Fixing Windows and ARM32 build

[Zhengyu Gu]

Apparently, you cannot avoids precompiled headers for selected files on 
Windows, or you have to turn it off all together.

Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/win-build/webrev.00/

Test:

   Windows X64 PCH and Non-PCH builds
   Linux x64 PCH and Non-PCH builds
   ARM32 PCH and Non-PCH builds


Thanks,

-Zhengyu