Implement control reducer, which reduces branches and phis together in a single fixpoint.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/665223006

Cr-Commit-Position: refs/heads/master@{#24891}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24891 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
[turbofan] add absolute peak to stats

R=danno@chromium.org

BUG=

Review URL: https://codereview.chromium.org/676693002

Cr-Commit-Position: refs/heads/master@{#24892}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24892 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
pass isolate to Value::To* functions

BUG=
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/669373002

Cr-Commit-Position: refs/heads/master@{#24893}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24893 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
[turbofan] delete graph and schedule before register allocation.

R=mstarzinger@chromium.org, titzer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/662513005

Cr-Commit-Position: refs/heads/master@{#24894}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24894 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
[turbofan] Reduce memory consumption of graph building

Allow reservation of additional input capacity when creating nodes to prevent switching to deque representation when adding well-known additional inputs.

Also ensure that only a single temporary buffer is used to create temporary input arrays before allocating nodes.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/644083003

Cr-Commit-Position: refs/heads/master@{#24896}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24896 ce2b1a6d-e550-0410-aec6-3dcde31c8c00