Fix a throw returning to a frame marked for lazy deopt that captures the stacktrace.

Fix a throw returning to a frame marked for lazy deopt that captures the stacktrace.

A lazy deopt via a return needs to preserve one value (the result), but via a throw needs to preserve two values (the exception and stacktrace).

Fixes #27446.

R=fschneider@google.com

Committed: https://github.com/dart-lang/sdk/commit/e1a252a017a3588b8b9ad58f854a1622a8372f6d

[rmacnak, 2016-09-28 22:48:10]

Description was changed from

==========
Fix a throw returning to a frame marked for lazy deopt that captures the
stacktrace.

A lazy deopt via a return needs to preserve one value (the result), but via a
throw needs to preserve two values (the exception and stacktrace).
==========

to

==========
Fix a throw returning to a frame marked for lazy deopt that captures the
stacktrace.

A lazy deopt via a return needs to preserve one value (the result), but via a
throw needs to preserve two values (the exception and stacktrace).

Fixes #27446.
==========

[rmacnak, 2016-09-28 23:27:38]

rmacnak@google.com changed reviewers:
+ fschneider@google.com

[Florian Schneider, 2016-09-28 23:36:43]

LGTM

[rmacnak, 2016-09-28 23:51:50]

Description was changed from

==========
Fix a throw returning to a frame marked for lazy deopt that captures the
stacktrace.

A lazy deopt via a return needs to preserve one value (the result), but via a
throw needs to preserve two values (the exception and stacktrace).

Fixes #27446.
==========

to

==========
Fix a throw returning to a frame marked for lazy deopt that captures the
stacktrace.

A lazy deopt via a return needs to preserve one value (the result), but via a
throw needs to preserve two values (the exception and stacktrace).

Fixes #27446.

R=fschneider@google.com

Committed:
https://github.com/dart-lang/sdk/commit/e1a252a017a3588b8b9ad58f854a1622a8372f6d
==========

[rmacnak, 2016-09-28 23:51:51]

Committed patchset #2 (id:20001) manually as
e1a252a017a3588b8b9ad58f854a1622a8372f6d (presubmit successful).