Fix following compiler warnings:

Fix following compiler warnings:

os_win.cc(266) : warning C4018: '>=' : signed/unsigned mismatch
stub_code_ia32.cc(89) : warning C4146: unary minus operator applied to unsigned type, result still unsigned
stub_code_ia32.cc(213) : warning C4146: unary minus operator applied to unsigned type, result still unsigned
stub_code_ia32.cc(317) : warning C4146: unary minus operator applied to unsigned type, result still unsigned
crypto_win.cc(5) : warning C4005: '_CRT_RAND_S' : macro redefinition
file_win.cc(512) : warning C4101: 'st' : unreferenced local variable

BUG=http://dartbug.com/21150
R=rmacnak@google.com

Committed: https://code.google.com/p/dart/source/detail?r=40826

[siva, 2014-09-30 21:52:08]

asiva@google.com changed reviewers:
+ rmacnak@google.com

[rmacnak, 2014-09-30 22:39:50]

https://codereview.chromium.org/619723004/diff/1/runtime/vm/stub_code_ia32.cc
File runtime/vm/stub_code_ia32.cc (right):

https://codereview.chromium.org/619723004/diff/1/runtime/vm/stub_code_ia32.cc...
runtime/vm/stub_code_ia32.cc:89: __ AddImmediate(ESP, Immediate(0 -
sizeof(NativeArguments)));
I think these need a static_cast or there will be a warning about mixing signed
and unsigned values in arithmetic.

[siva, 2014-09-30 23:05:36]

https://codereview.chromium.org/619723004/diff/1/runtime/vm/stub_code_ia32.cc
File runtime/vm/stub_code_ia32.cc (right):

https://codereview.chromium.org/619723004/diff/1/runtime/vm/stub_code_ia32.cc...
runtime/vm/stub_code_ia32.cc:89: __ AddImmediate(ESP, Immediate(0 -
sizeof(NativeArguments)));
On 2014/09/30 22:39:50, rmacnak wrote:
> I think these need a static_cast or there will be a warning about mixing
signed
> and unsigned values in arithmetic.

Done.

[rmacnak, 2014-09-30 23:10:43]

LGTM

[siva, 2014-09-30 23:29:32]

Committed patchset #2 (id:20001) manually as r40826 (presubmit successful).