RFR: JDK-8171929: "make docs" in clean forest is broken

[Erik Joelsson]

The new module, jdk.vm.compiler (as well as jdk.vm.ci), requires access 
to some of the newly built class files in order to run an annotation 
processor in the gensrc step. The extra dependency declaration for this 
is currently missing one module (java.instrument) in make/Main.gmk. To 
avoid having to maintain the list of modules they depend on in two 
places (module-info.java and the makefile), we can generate the 
dependency targets in the makefile, since we already have the module 
dependency information in make.

Bug: https://bugs.openjdk.java.net/browse/JDK-8171929

Webrev: http://cr.openjdk.java.net/~erikj/8171929/webrev.01/

/Erik