Remove dead code for generated code coverage.

src/arm64/macro-assembler-arm64.h

Index: src/arm64/macro-assembler-arm64.h
diff --git a/src/arm64/macro-assembler-arm64.h b/src/arm64/macro-assembler-arm64.h
index ca4f2f2a0f38e7b6646b9c7cbe5dd89eca287a93..06e9a1d9bb8ad7e0660a375fc85dc81eef95bec3 100644
--- a/src/arm64/macro-assembler-arm64.h
+++ b/src/arm64/macro-assembler-arm64.h
@@ -2312,14 +2312,6 @@ class InlineSmiCheckInfo {
 }  // namespace internal
 }  // namespace v8
 
-#ifdef GENERATED_CODE_COVERAGE
-#error "Unsupported option"
-#define CODE_COVERAGE_STRINGIFY(x) #x
-#define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
-#define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
-#define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
-#else
 #define ACCESS_MASM(masm) masm->
-#endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_