Rename ReverseCondition to CommuteCondition, a more standard term.

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index 2b1a8d60568d68890b4a7c312f0eb5f0217b1b8f..4e3b87c4ded9cd41a93f9afe055031b325da4628 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -326,8 +326,8 @@ inline Condition NegateCondition(Condition cc) {
 }
 
 
-// Corresponds to transposing the operands of a comparison.
-inline Condition ReverseCondition(Condition cc) {
+// Commute a condition such that a cond b == b cond' b.
+inline Condition CommuteCondition(Condition cc) {
   switch (cc) {
     case below:
       return above;