[arm64] Fix assertion in IsImmLLiteral and enable literal pool tests.

src/arm64/assembler-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARM64_ASSEMBLER_ARM64_H_
 #define V8_ARM64_ASSEMBLER_ARM64_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 3476 matching lines @@
 
   // Code generation
   // The relocation writer's position is at least kGap bytes below the end of
   // the generated instructions. This is so that multi-instruction sequences do
   // not have to check for overflow. The same is true for writes of large
   // relocation info entries, and debug strings encoded in the instruction
   // stream.
   static constexpr int kGap = 128;
 
  public:
+#ifdef DEBUG
+  // Functions used for testing.
+  int GetConstantPoolEntriesSizeForTesting() const {
+    // Do not include branch over the pool.
+    return constpool_.EntryCount() * kPointerSize;
+  }
+
+  static constexpr int GetCheckConstPoolIntervalForTesting() {
+    return kCheckConstPoolInterval;
+  }
+
+  static constexpr int GetApproxMaxDistToConstPoolForTesting() {
+    return kApproxMaxDistToConstPool;
+  }
+#endif
+
   class FarBranchInfo {
    public:
     FarBranchInfo(int offset, Label* label)
         : pc_offset_(offset), label_(label) {}
     // Offset of the branch in the code generation buffer.
     int pc_offset_;
     // The label branched to.
     Label* label_;
   };
 
@@ skipping 104 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBufferSpace();
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_H_