Primarily to make the argument numbering more sensible (1-based incrementing by 1, rather than 0-based incrementing by 4). The CTI name also seems to be being deprecated from the code generally.
Created attachment 25996 [details] The patch
Comment on attachment 25996 [details] The patch r=me
Sending JavaScriptCore/ChangeLog Sending JavaScriptCore/jit/JIT.cpp Sending JavaScriptCore/jit/JIT.h Sending JavaScriptCore/jit/JITArithmetic.cpp Sending JavaScriptCore/jit/JITCall.cpp Sending JavaScriptCore/jit/JITInlineMethods.h Sending JavaScriptCore/jit/JITPropertyAccess.cpp Transmitting file data ....... Committed revision 39268.