Simplify Boolean expressions

This patch simplifies boolean expressions acorss LLDB. It was generated
using clang-tidy with the following command:

run-clang-tidy.py -checks='-*,readability-simplify-boolean-expr' -format -fix $PWD

Differential revision: https://reviews.llvm.org/D55584

llvm-svn: 349215

lldb/source/Plugins/OperatingSystem/Python/OperatingSystemPython.cpp

@@ -213,7 +213,7 @@ bool OperatingSystemPython::UpdateThreadList(ThreadList &old_thread_list,
   // beginning of the list
   uint32_t insert_idx = 0;
   for (uint32_t core_idx = 0; core_idx < num_cores; ++core_idx) {
-    if (core_used_map[core_idx] == false) {
+    if (!core_used_map[core_idx]) {
       new_thread_list.InsertThread(
           core_thread_list.GetThreadAtIndex(core_idx, false), insert_idx);
       ++insert_idx;