for (re-)review (M): 6814659: separable cleanups and subroutines for 6655638

[John Rose]

In order to reduce the size of my forthcoming method handles  
changeset, I have (at Vladimir's suggestion) pulled out chunks of  
independent changes this week.  The four chunks amount to about 40% of  
the changes, and are more easily tested and reviewed in isolation.

The fourth chunk 6814659 is the most miscellaneous.  It is a bunch of  
changes that were necessary either for debugging method handles, or  
for supporting them.  They can all be considered independently.

Here are the changes:
   http://cr.openjdk.java.net/~jrose/6814659/webrev.00/

Not much review is necessary here, because these changes have already  
been reviewed as part of the larger changeset.

The current draft of the big change is here:
   http://cr.openjdk.java.net/~jrose/6655638/webrev.00/

-- John

P.S. For the record, here is the sequence:

1. 6812678: macro assembler needs delayed binding of a few constants  
(for 6655638)
   http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/56aae7be60d4

2. 6812831: factor duplicated assembly code for megamorphic  
invokeinterface (for 6655638)
   http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/9adddb8c0fc8

3. 6812831 factor general subclass check (for 6655638)
   http://cr.openjdk.java.net/~jrose/6813212/webrev.01/  (not yet  
integrated)

4. 6814659: separable cleanups and subroutines for 6655638
   http://cr.openjdk.java.net/~jrose/6814659/webrev.00/  (not yet  
integrated)

5. 6655638: dynamic languages need method handles
   http://cr.openjdk.java.net/~jrose/6655638/webrev.00/  (not yet  
integrated)

And here are the patch file sizes (from my mq patch queue):

     1178    5493   48571 asm-6812678.patch
      979    5029   40958 ilookup-6812831.patch
     1611    7834   70518 subtype-6813212.patch
     1147    4962   48089 minor-6814659.patch
     7274   33505  311948 meth.patch
    12189   56823  520084 total

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