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/Expression/ExpressionSourceCode.cpp

@@ -105,10 +105,7 @@ public:
       if (m_file_stack.back() != m_current_file)
         return true;
 
-      if (line >= m_current_file_line)
-        return false;
-      else
-        return true;
+      return line < m_current_file_line;
     default:
       return false;
     }
@@ -378,7 +375,5 @@ bool ExpressionSourceCode::GetOriginalBodyBounds(
     return false;
   start_loc += strlen(start_marker);
   end_loc = transformed_text.find(end_marker);
-  if (end_loc == std::string::npos)
-    return false;
-  return true;
+  return end_loc != std::string::npos;
 }