Remove dead code for generated code coverage.

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 85c0228a7453cbac736f34e5c6139c7e2d6cbd27..4176a29a0c02abec3c93bc8fa905c639558317b6 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -280,10 +280,6 @@ bool Operand::AddressUsesRegister(Register reg) const {
 // -----------------------------------------------------------------------------
 // Implementation of Assembler.
 
-#ifdef GENERATED_CODE_COVERAGE
-static void InitCoverageLog();
-#endif
-
 Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
     : AssemblerBase(isolate, buffer, buffer_size), code_targets_(100) {
 // Clear the buffer in debug mode unless it was provided by the
@@ -296,11 +292,6 @@ Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
 #endif
 
   reloc_info_writer.Reposition(buffer_ + buffer_size_, pc_);
-
-
-#ifdef GENERATED_CODE_COVERAGE
-  InitCoverageLog();
-#endif
 }