Allocate named parameter names in old space

Allocate named parameter names in old space

Make sure the array of names of named actual parameters remains
in old space when it grows. The array may be used as a literal
when generating code for a NSM exception, so it must be in old space.

Fixes issue 23121.

R=asiva@google.com

Committed: https://code.google.com/p/dart/source/detail?r=45024

[hausner, 2015-04-09 17:53:50]

hausner@google.com changed reviewers:
+ asiva@google.com

[siva, 2015-04-09 18:33:41]

lgtm

[hausner, 2015-04-09 18:37:47]

Committed patchset #1 (id:1) manually as r45024 (presubmit successful).