Added a workaround for undefined behavior.

src/compiler/instruction.h

Index: src/compiler/instruction.h
diff --git a/src/compiler/instruction.h b/src/compiler/instruction.h
index c9e5761ca94db74b69b6bcc641590d096d32f228..e585eed6d16598ab6668ee64ddec7c2bae534289 100644
--- a/src/compiler/instruction.h
+++ b/src/compiler/instruction.h
@@ -737,7 +737,7 @@ class Constant FINAL {
     kRpoNumber
   };
 
-  explicit Constant(int32_t v) : type_(kInt32), value_(v) {}
+  explicit Constant(int32_t v);
   explicit Constant(int64_t v) : type_(kInt64), value_(v) {}
   explicit Constant(float v) : type_(kFloat32), value_(bit_cast<int32_t>(v)) {}
   explicit Constant(double v) : type_(kFloat64), value_(bit_cast<int64_t>(v)) {}