MIPS: Fixed faulty branch condition handling for doubles.

src/mips/constants-mips.h

Index: src/mips/constants-mips.h
diff --git a/src/mips/constants-mips.h b/src/mips/constants-mips.h
index e7c55f5806210aec0981f0012a212f182b947b42..139e7db033c555adf6426674ac477bc21f190c25 100644
--- a/src/mips/constants-mips.h
+++ b/src/mips/constants-mips.h
@@ -429,7 +429,9 @@ enum SecondaryField {
 
 // ----- Emulated conditions.
 // On MIPS we use this enum to abstract from conditionnal branch instructions.
-// the 'U' prefix is used to specify unsigned comparisons.
+// The 'U' prefix is used to specify unsigned comparisons.
+// Oppposite conditions must be paired as odd/even numbers
+// because 'NegateCondition' function flips LSB to negate condition.
 enum Condition {
   // Any value < 0 is considered no_condition.
   kNoCondition  = -1,
@@ -450,8 +452,10 @@ enum Condition {
   greater_equal = 13,
   less_equal    = 14,
   greater       = 15,
+  ueq           = 16,  // Unordered or Equal.
+  nue           = 17,  // Not (Unordered or Equal).
 
-  cc_always     = 16,
+  cc_always     = 18,
 
   // Aliases.
   carry         = Uless,