Rename codegen to macro-assembler....

Rename codegen to macro-assembler.
Remove unneeded byte codes accidentally not removed after feedback from last review
More tests.
New instructions to check for end of input.
Rename captures array to registers array.

Committed: http://code.google.com/p/v8/source/detail?r=711

[Lasse Reichstein, 2008-11-07 10:57:35]

The file src/regexp-macro-assembler-re2k.h was not added correctly (no A left of
it in the list). Sorry, this CL might fubar too.

Otherwise LGTM.

http://codereview.chromium.org/9690/diff/1/13
File src/assembler-re2k.h (right):

http://codereview.chromium.org/9690/diff/1/13#newcode47
Line 47: void Break();  // This insn will cause a fatal VM error if hit.
insn->instruction

http://codereview.chromium.org/9690/diff/1/12
File src/interpreter-re2k.cc (right):

http://codereview.chromium.org/9690/diff/1/12#newcode202
Line 202: UNREACHABLE();
Remember a "break;" after the last BYTECODE macro instance.