Remove broken %_Log functionality.

Remove broken %_Log functionality.

R=yangguo@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=21160

[Michael Starzinger, 2014-05-06 08:26:26]

Turns out that having dead code in the code-base is a bad idea. The --log-regexp
feature is broken for several reasons:

1) Some mutex assertions during log-printing (not fixed by this CL)
2) MacroAssembler::CallRuntime is a NOP when called with wrong number of
arguments.
3) MacroAssembler::IllegalOperation actually only returns undefined, but doesn't
report illegal operations in any way.
4) Optimized code already ignores %_Log calls.

This amount of breakage leads me to believe that %_Log isn't too popular and
hence I propose to remove (4) from the code-base. This CL also fixes (2) and
removes (3) to avoid future surprises.

[Yang, 2014-05-06 08:31:32]

Good riddance. LGTM with comments.

https://codereview.chromium.org/265283007/diff/1/src/runtime.h
File src/runtime.h (right):

https://codereview.chromium.org/265283007/diff/1/src/runtime.h#newcode547
src/runtime.h:547: F(Log, 2, 1) \
I think this can be removed too, including RuntimeHidden_Log and
Logger::LogRuntime and FLAG_log_runtime.

[Michael Starzinger, 2014-05-06 08:57:20]

Thanks for the review. Addressed comment. Landing.

https://codereview.chromium.org/265283007/diff/1/src/runtime.h
File src/runtime.h (right):

https://codereview.chromium.org/265283007/diff/1/src/runtime.h#newcode547
src/runtime.h:547: F(Log, 2, 1) \
On 2014/05/06 08:31:32, Yang wrote:
> I think this can be removed too, including RuntimeHidden_Log and
> Logger::LogRuntime and FLAG_log_runtime.

Done.

[Michael Starzinger, 2014-05-06 09:28:30]

Committed patchset #3 manually as r21160 (presubmit successful).