hg: build-infra/jdk9/hotspot: * Move dtrace logic to separate file.

[magnus.ihse.bursie at oracle.com]

Changeset: 2ca48315f316
Author:    ihse
Date:      2015-10-12 12:34 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk9/hotspot/rev/2ca48315f316

* Move dtrace logic to separate file.
* Guard dtrace code with feature check.
* Guard precompiled headers on macosx with feature check.

! makefiles/CompileJvm.gmk
! makefiles/CompileLibraries.gmk
! makefiles/Dist.gmk
! makefiles/Dtrace.gmk
! makefiles/GenerateSources.gmk
! makefiles/JvmPlatforms.gmk