kernel->ssa: Implement for-loops and while-loops

kernel->ssa: Implement for-loops and while-loops

This involved splitting out the loop handling logic from the
original SSA builder and sharing it with the kernel builder.
This was just the easiest way to do this for now, but in the future
we should write the loop handler for kernel to take into account
the simplified structure that kernel provides.

R=sra@google.com

Committed: https://github.com/dart-lang/sdk/commit/3a01cbd31c5c4787dd6578a6f6fd767caef13fbd

[Harry Terkelsen, 2016-09-21 21:00:47]

het@google.com changed reviewers:
+ johnniwinther@google.com, sra@google.com

[sra1, 2016-09-21 23:22:46]

LGTM.

Perhaps as a separate cleanup, move loopDepth into the loop handler.

[Harry Terkelsen, 2016-09-21 23:38:15]

Description was changed from

==========
kernel->ssa: Implement for-loops and while-loops

This involved splitting out the loop handling logic from the
original SSA builder and sharing it with the kernel builder.
This was just the easiest way to do this for now, but in the future
we should write the loop handler for kernel to take into account
the simplified structure that kernel provides.
==========

to

==========
kernel->ssa: Implement for-loops and while-loops

This involved splitting out the loop handling logic from the
original SSA builder and sharing it with the kernel builder.
This was just the easiest way to do this for now, but in the future
we should write the loop handler for kernel to take into account
the simplified structure that kernel provides.

R=sra@google.com

Committed:
https://github.com/dart-lang/sdk/commit/3a01cbd31c5c4787dd6578a6f6fd767caef13fbd
==========

[Harry Terkelsen, 2016-09-21 23:38:16]

Committed patchset #1 (id:1) manually as
3a01cbd31c5c4787dd6578a6f6fd767caef13fbd (presubmit successful).