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

src/mips/debug-mips.cc

Index: src/mips/debug-mips.cc
diff --git a/src/mips/debug-mips.cc b/src/mips/debug-mips.cc
index 48771d3dc53c5b0ebfb3b3bf1696ee81d7bda924..59db832a1d8f6c96ac5e9d8f8c793477992ffeb6 100644
--- a/src/mips/debug-mips.cc
+++ b/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);
 }