[turbofan] Allow deopt reasons without source positions.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index a32bc5a80ba0b83d7341eaf875557efc07e1aa41..d9b609a854c39f744c1e0dadfed773689ecedac7 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -296,6 +296,9 @@ inline LanguageMode construct_language_mode(bool strict_bit) {
 // This constant is used as an undefined value when passing source positions.
 const int kNoSourcePosition = -1;
 
+// This constant is used to indicate missing deoptimization information.
+const int kNoDeoptimizationId = -1;
+
 // Mask for the sign bit in a smi.
 const intptr_t kSmiSignMask = kIntptrSignBit;