Improved --trace-opt output a bit.

Improved --trace-opt output a bit.

This ensures that we always have a kind of "brace" around the actual compilation
with --trace-opt. Previously this was coupled to --trace-hydrogen for
Crankshaft, and there was no output at the start of the compilation for
TurboFan.

Removed redundant "[completed...]" output: Whenever the compilation was
successful, we have already printed "[optimizing...took...]".

Output total TurboFanning time with --trace-opt, too (basically as graph
building time, this is rather arbitrary).

R=bmeurer@chromium.org

Committed: https://crrev.com/50b7ca5593b454e923c9f4707dc45322f9a39ef9
Cr-Commit-Position: refs/heads/master@{#25900}

[Sven Panne, 2014-12-19 11:41:28]

svenpanne@chromium.org changed reviewers:
+ bmeurer@chromium.org

[Benedikt Meurer, 2014-12-19 11:42:13]

https://codereview.chromium.org/819613002/diff/1/src/compiler.cc
File src/compiler.cc (right):

https://codereview.chromium.org/819613002/diff/1/src/compiler.cc#newcode434
src/compiler.cc:434: << " using hydrogen]" << std::endl;
"using CrankShaft" for consistency?

[Sven Panne, 2014-12-19 11:46:54]

https://codereview.chromium.org/819613002/diff/1/src/compiler.cc
File src/compiler.cc (right):

https://codereview.chromium.org/819613002/diff/1/src/compiler.cc#newcode434
src/compiler.cc:434: << " using hydrogen]" << std::endl;
On 2014/12/19 11:42:13, Benedikt Meurer wrote:
> "using CrankShaft" for consistency?

Done.

[Benedikt Meurer, 2014-12-19 11:47:04]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2014-12-19 11:47:04]

lgtm

[Sven Panne, 2014-12-19 11:47:34]

Committed patchset #2 (id:20001) manually as
50b7ca5593b454e923c9f4707dc45322f9a39ef9 (presubmit successful).

[commit-bot: I haz the power, 2014-12-19 11:47:40]

Patchset 2 (id:??) landed as
https://crrev.com/50b7ca5593b454e923c9f4707dc45322f9a39ef9
Cr-Commit-Position: refs/heads/master@{#25900}