preliminary review request (M): 6983728: JSR 292 remove argument count limitations

[John Rose]

http://cr.openjdk.java.net/~jrose/6983728/webrev.00/

6983728: JSR 292 remove argument count limitations
Summary: Remove workarounds and limitations from before 6939861.
Reviewed-by: ?

Remove test exclusions from MethodHandlesTest (key unit test), and extend argument counts of test cases.

Remove the following files, which were workarounds for the lack of ricochet frames:
  FilterGeneric.java FilterOneArgument.java FromGeneric.java SpreadGeneric.java ToGeneric.java

Note: These changes assume a full port of 6939861.  This is true of x86 at present; SPARC is following.  This change will not be done until after SPARC stabilizes.