remove equality kind from compare nil ic

use compare nil ic only for non-strict equality. strict-equality only has one check and cannot deopt. should therefore not be part of the stub.

BUG=
R=rossberg@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=15045

[rossberg, 2013-06-10 11:43:54]

LGTM with nits

https://codereview.chromium.org/16732002/diff/2001/src/arm/full-codegen-arm.cc
File src/arm/full-codegen-arm.cc (right):

https://codereview.chromium.org/16732002/diff/2001/src/arm/full-codegen-arm.c...
src/arm/full-codegen-arm.cc:4777: nil);
Nit: fits on previous line now (similarly in other backends)

https://codereview.chromium.org/16732002/diff/2001/src/code-stubs.h
File src/code-stubs.h (right):

https://codereview.chromium.org/16732002/diff/2001/src/code-stubs.h#newcode1222
src/code-stubs.h:1222: InitializationState init_state)
Nit: fits on one line now

https://codereview.chromium.org/16732002/diff/2001/src/hydrogen.cc
File src/hydrogen.cc (right):

https://codereview.chromium.org/16732002/diff/2001/src/hydrogen.cc#newcode9926
src/hydrogen.cc:9926: value, (nil== kNullValue) ? graph()->GetConstantNull()
Nit: space before ==

https://codereview.chromium.org/16732002/diff/2001/src/mips/full-codegen-mips.cc
File src/mips/full-codegen-mips.cc (left):

https://codereview.chromium.org/16732002/diff/2001/src/mips/full-codegen-mips...
src/mips/full-codegen-mips.cc:4808: EqualityKind kind = expr->op() ==
Token::EQ_STRICT
Please don't change MIPS code

[oliv, 2013-06-10 15:47:35]

Committed patchset #3 manually as r15045 (presubmit successful).