Rename variables to conform to LLVM naming conventions.

llvm-svn: 302697
diff --git a/lld/lib/Core/TaskGroup.cpp b/lld/lib/Core/TaskGroup.cpp
index d4de48c..6cd5d22 100644
--- a/lld/lib/Core/TaskGroup.cpp
+++ b/lld/lib/Core/TaskGroup.cpp
@@ -132,10 +132,10 @@
 #endif
 }
 
-void TaskGroup::spawn(std::function<void()> f) {
-  _latch.inc();
-  Executor::getDefaultExecutor()->add([&, f] {
-    f();
-    _latch.dec();
+void TaskGroup::spawn(std::function<void()> F) {
+  L.inc();
+  Executor::getDefaultExecutor()->add([&, F] {
+    F();
+    L.dec();
   });
 }