Adds back simple dead code elimination to the bytecode pipeline.
BUG=v8:4280,chromium:616064
Review-Url: https://codereview.chromium.org/2038083002
Cr-Commit-Position: refs/heads/master@{#37147}
With this change the bytecode array builder only emits expression
positions for bytecodes that can throw. This allows more peephole
optimization opportunities and results in smaller code.
BUG=v8:4280,chromium:615979
LOG=N
Review-Url: https://codereview.chromium.org/2038323002
Cr-Commit-Position: refs/heads/master@{#36863}
The optimization stages in the bytecode generation pipeline must
preserve source position information. Failure to preserve
source position information could result in single stepping
in the debugger misbehaving or mis-reporting in exception stack traces.
This change adds tests intended to check optimizations do not damage
source position info.
BUG=v8:4280
LOG=N
Review-Url: https://codereview.chromium.org/2042633002
Cr-Commit-Position: refs/heads/master@{#36855}
