Support Int32 representation for selected binary operations.

runtime/vm/deopt_instructions.h

Index: runtime/vm/deopt_instructions.h
diff --git a/runtime/vm/deopt_instructions.h b/runtime/vm/deopt_instructions.h
index bdb386d6b8e29892ae219d03e9a2e06904387ffd..c2ee73565ae7a4edf9dbbf98a8136e8591da34da 100644
--- a/runtime/vm/deopt_instructions.h
+++ b/runtime/vm/deopt_instructions.h
@@ -220,6 +220,7 @@ class DeoptInstr : public ZoneAllocated {
     // Mints are split into low and high words. Each word can be in a register
     // or stack slot. Note Mints are only used on 32-bit architectures.
     kMintPair,
+    kInt32,
     kUint32,
     kPcMarker,
     kPp,