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
diff --git a/lldb/source/API/SBThread.cpp b/lldb/source/API/SBThread.cpp
index 5771b37..97a9df6 100644
--- a/lldb/source/API/SBThread.cpp
+++ b/lldb/source/API/SBThread.cpp
@@ -571,7 +571,7 @@
             success = true;
           }
           if (node->GetType() == eStructuredDataTypeBoolean) {
-            if (node->GetAsBoolean()->GetValue() == true)
+            if (node->GetAsBoolean()->GetValue())
               strm.Printf("true");
             else
               strm.Printf("false");
@@ -1470,7 +1470,7 @@
     }
   }
 
-  if (log && sb_origin_thread.IsValid() == false)
+  if (log && !sb_origin_thread.IsValid())
     log->Printf("SBThread(%p)::GetExtendedBacktraceThread() is not returning a "
                 "Valid thread",
                 static_cast<void *>(exe_ctx.GetThreadPtr()));