[patch] Build fixes for x86_{32,64}

[Aleksey Shipilev]

There are lots of build failures for current loom/loom (fibers):
  https://builds.shipilev.net/openjdk-loom/

This patch the first stab at fixing x86_{32,64} build failures:
  http://cr.openjdk.java.net/~shade/loom/build-fixes-x86/webrev.01/

Please push where and how you see fit. Probably squashing all changes into one.

Thanks,
-Aleksey