X64: enable stack sampling in profiler.

X64: enable stack sampling in profiler.

Added necessary code to initialize Top::js_entry_sp value.
Renamed 'test-log-ia32' test to 'test-log-stack-tracer' and enabled it in 64-bit version.

Committed: http://code.google.com/p/v8/source/detail?r=2597

[William Hesse, 2009-07-31 10:00:12]

LGTM.

http://codereview.chromium.org/160446/diff/1/4
File src/x64/codegen-x64.cc (right):

http://codereview.chromium.org/160446/diff/1/4#newcode6616
Line 6616: __ j(NegateCondition(zero), &not_outermost_js);
What is the difference between not_zero and NegateCondition(zero)?

[Mikhail Naganov, 2009-07-31 11:06:05]

http://codereview.chromium.org/160446/diff/1/4
File src/x64/codegen-x64.cc (right):

http://codereview.chromium.org/160446/diff/1/4#newcode6616
Line 6616: __ j(NegateCondition(zero), &not_outermost_js);
On 2009/07/31 10:00:12, William Hesse wrote:
> What is the difference between not_zero and NegateCondition(zero)?
> 

Thanks. I rarely touch code generation, so I'm not aware of all shortcuts it
has. Fixed.