MIPS: Fix comment in r21905: "Support LiveEdit."

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/345243005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21948 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/debug-mips.cc

@@ -327,7 +327,7 @@ void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
   __ lw(at, FieldMemOperand(at, SharedFunctionInfo::kCodeOffset));
   __ Addu(t9, at, Operand(Code::kHeaderSize - kHeapObjectTag));
 
-  // Re-run JSFunction, r1 is function, cp is context.
+  // Re-run JSFunction, a1 is function, cp is context.
   __ Jump(t9);
 }