Bug 1478679 - Fix memory leak in LCovRealm. r=nbp

js/src/vm/CodeCoverage.cpp

@@ -457,6 +457,12 @@ LCovRealm::LCovRealm()
     MOZ_ASSERT(alloc_.isEmpty());
 }
 
+LCovRealm::~LCovRealm()
+{
+    if (sources_)
+        sources_->~LCovSourceVector();
+}
+
 void
 LCovRealm::collectCodeCoverageInfo(JS::Realm* realm, JSScript* script, const char* name)
 {

js/src/vm/CodeCoverage.h

@@ -85,6 +85,7 @@ class LCovRealm
 {
   public:
     LCovRealm();
+    ~LCovRealm();
 
     // Collect code coverage information for the given source.
     void collectCodeCoverageInfo(JS::Realm* realm, JSScript* topLevel, const char* name);