Small cleanup of the code generator: make the static code gen...

Small cleanup of the code generator: make the static code gen
functions and the ones defined on the AST nodes take a code generator,
rather than a macro assembler and (sometimes) scope.

Uniformly use the __ macro for masm_/masm in the codegen*.cc files.

Committed: http://code.google.com/p/v8/source/detail?r=408

[Kasper Lund, 2008-10-02 08:57:58]

We still need to move the __ definitions around so we don't define and undef
them all over the place. We should also work towards a good solution for the
virtual scope() function in CodeGenerator; ideally we should pass something
around that would allow us to call the platform-specific functions in an easy
way without having to add a lot of virtual functions to CodeGenerator.

LGTM.

http://codereview.chromium.org/5663/diff/1/4
File src/codegen-arm.cc (right):

http://codereview.chromium.org/5663/diff/1/4#newcode2062
Line 2062: masm->pop(r0);  // value
Shouldn't this be __?

http://codereview.chromium.org/5663/diff/1/5
File src/codegen-ia32.cc (right):

http://codereview.chromium.org/5663/diff/1/5#newcode196
Line 196: static Operand ParameterOperand(const CodeGenerator* cgen, int index)
{
Extra whitespace at end of line?