Version 5.9.34.2 (cherry-pick)

Merged 64fbb30

[turbofan] BitcastWordToTagged must not be pure.

TBR=machenbach@chromium.org

Review-Url: https://codereview.chromium.org/2738153002 .
Cr-Commit-Position: refs/heads/5.9.34@{v8#3}
Cr-Branched-From: cce8a19-refs/heads/master@{#43682}

Version 5.9.34.1 (Turn on I+TF)

Merged 0f716ac

Turn on Ignition + TurboFan.

TBR=machenbach@chromium.org

Review-Url: https://codereview.chromium.org/2740043002 .
Cr-Commit-Position: refs/heads/5.9.34@{v8#2}
Cr-Branched-From: cce8a19-refs/heads/master@{#43682}

Version 5.9.34

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.9.34@{#1}
Cr-Branched-From: cce8a19-refs/heads/master@{#43682}

Version 5.8.283.9

Cr-Commit-Position: refs/branch-heads/5.8@{v8#20}
Cr-Branched-From: eda659c-refs/heads/5.8.283@{#1}
Cr-Branched-From: 4310cd0-refs/heads/master@{#43429}

Version 5.9.33

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.9.33@{#1}
Cr-Branched-From: b643bb7-refs/heads/master@{#43679}

Version 5.9.32

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.9.32@{#1}
Cr-Branched-From: cb3f137-refs/heads/master@{#43677}

Version 5.9.31

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.9.31@{#1}
Cr-Branched-From: 72975d3-refs/heads/master@{#43675}

Version 5.9.30

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.9.30@{#1}
Cr-Branched-From: 6560707-refs/heads/master@{#43671}

Version 5.9.29

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.9.29@{#1}
Cr-Branched-From: 938e06f-refs/heads/master@{#43664}

Version 5.9.28

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.9.28@{#1}
Cr-Branched-From: 77165eb-refs/heads/master@{#43662}