Remove some leftovers of full-codegen's generators implementation.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index 2169b15c1d98cfad7e2dd5ec0d32e65e766f7bc3..ff6bfd48f2861de683eb27347c174a500fea427f 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -413,9 +413,6 @@ class RelocInfo {
     // Encoded internal reference, used only on MIPS, MIPS64 and PPC.
     INTERNAL_REFERENCE_ENCODED,
 
-    // Continuation points for a generator yield.
-    GENERATOR_CONTINUATION,
-
     // Marks constant and veneer pools. Only used on ARM and ARM64.
     // They use a custom noncompact encoding.
     CONST_POOL,
@@ -524,9 +521,6 @@ class RelocInfo {
   static inline bool IsCodeAgeSequence(Mode mode) {
     return mode == CODE_AGE_SEQUENCE;
   }
-  static inline bool IsGeneratorContinuation(Mode mode) {
-    return mode == GENERATOR_CONTINUATION;
-  }
   static inline bool IsWasmMemoryReference(Mode mode) {
     return mode == WASM_MEMORY_REFERENCE;
   }