Fix a few potential integer negation overflows

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index 075a51f95999a1c8a59a21e589b16ce6f0d63d2c..227f23859f2735d358a6a3aebf1c06fd3480474e 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -2899,6 +2899,8 @@ Object* FrameDescription::GetExpression(int index) {
 
 
 void TranslationBuffer::Add(int32_t value, Zone* zone) {
+  // This wouldn't handle kMinInt correctly if it ever encountered it.
+  DCHECK(value != kMinInt);
   // Encode the sign bit in the least significant bit.
   bool is_negative = (value < 0);
   uint32_t bits = ((is_negative ? -value : value) << 1) |