when open macro GENERATED_CODE_COVERAGE, fix compiler error and fd leak

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index 6497ba6db0a980e8af1c3b0153ea18a84b18db9d..465f1490de9c2b3b180438a28ae4808fa42505b2 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -235,6 +235,7 @@ Register Operand::reg() const {
 
 #ifdef GENERATED_CODE_COVERAGE
 static void InitCoverageLog();
+static void DeinitCoverageLog();
 #endif
 
 Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
@@ -256,6 +257,11 @@ Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
 #endif
 }
 
+Assembler::~Assembler() {
+#ifdef GENERATED_CODE_COVERAGE
+  DeinitCoverageLog();
+#endif
+}
 
 void Assembler::GetCode(CodeDesc* desc) {
   // Finalize code (at this point overflow() may be true, but the gap ensures
@@ -2622,11 +2628,17 @@ static FILE* coverage_log = NULL;
 
 static void InitCoverageLog() {
   char* file_name = getenv("V8_GENERATED_CODE_COVERAGE_LOG");
-  if (file_name != NULL) {
+  if (file_name != NULL && NULL == coverage_log) {
     coverage_log = fopen(file_name, "aw+");
   }
 }
 
+static void DeinitCoverageLog() {
+	if (coverage_log != NULL) {
+	  fclose(coverage_log);
+	  coverage_log = NULL;
+	}
+}
 
 void LogGeneratedCodeCoverage(const char* file_line) {
   const char* return_address = (&file_line)[-1];