RFR (S): Issue constants to constant pool in stub code

[Lindenmaier, Goetz]

Hi,

When adding constants to the constant pool, the code_section is switched
to the constant pool code_section, and then back again.  It was hard coded
to switch back to the code_section for code.
If constants are issued in stubs, it is switched back to the wrong code section.
I changed the code to remember the code section and switch back to the proper
one.
Further it's necessary to relocate only after copying code and stub section to
a new location, as the relocation might affect an address in the stub section.

You can find these changes here:
http://cr.openjdk.java.net/~goetz/webrevs/webrev-const_in_stub/

or in our ppc port:
http://hg.openjdk.java.net/ppc-aix-port/jdk7u/hotspot/rev/b288e82d9062

Thank you and best regards,
  Goetz


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