Fix invalid locations problem for inline super constructors.

Fix invalid locations problem for inline super constructors.

This is a quick fix for issue 5184.

R=ahe@google.com
BUG=5184
Committed: https://code.google.com/p/dart/source/detail?r=12853

[podivilov, 2012-09-25 14:30:46]

Currently compiler could possibly crash only when elements belong to different
source files. More robust solution is to assert that attached location is always
inside the enclosing element, so we can easily detect invalid location bugs
using our test base.

[ahe, 2012-09-25 15:22:30]

LGTM, but I would really like to have a test case for this.

See the test I wrote for http://code.google.com/p/dart/source/detail?r=12787.

Notice how I use a long comment to force a crash.

[podivilov, 2012-09-25 17:16:56]

On 2012/09/25 15:22:30, ahe wrote:
> LGTM, but I would really like to have a test case for this.
> 
> See the test I wrote for http://code.google.com/p/dart/source/detail?r=12787.
> 
> Notice how I use a long comment to force a crash.

Landing this as is to resolve P1 issue. I'm going to add a test tomorrow.