Don't double-count stack slots when compiling optimized try-catch.

Don't double-count stack slots when compiling optimized try-catch.

The fixed slots used by try-catch are already accounted for in the
register allocator. This change avoids wasting unnecessary stack space
for optimized functions containing try-catch.

R=kmillikin@google.com

Committed: https://code.google.com/p/dart/source/detail?r=23899

[Florian Schneider, 2013-06-12 08:44:24]

Thanks Kevin for pointing this out.

[Kevin Millikin (Google), 2013-06-12 09:25:22]

lgtm

[Florian Schneider, 2013-06-12 09:31:37]

Committed patchset #1 manually as r23899 (presubmit successful).