[Logging] Replace Log::Printf with LLDB_LOG macro (NFC)

This patch replaces explicit calls to log::Printf with the new LLDB_LOGF
macro. The macro is similar to LLDB_LOG but supports printf-style format
strings, instead of formatv-style format strings.

So instead of writing:

  if (log)
    log->Printf("%s\n", str);

You'd write:

  LLDB_LOG(log, "%s\n", str);

This change was done mechanically with the command below. I replaced the
spurious if-checks with vim, since I know how to do multi-line
replacements with it.

  find . -type f -name '*.cpp' -exec \
  sed -i '' -E 's/log->Printf\(/LLDB_LOGF\(log, /g' "{}" +

Differential revision: https://reviews.llvm.org/D65128

llvm-svn: 366936

lldb/source/API/SBFrame.cpp

@@ -1120,10 +1120,10 @@ lldb::SBValue SBFrame::EvaluateExpression(const char *expr,
     }
   }
 
-  if (expr_log)
-    expr_log->Printf("** [SBFrame::EvaluateExpression] Expression result is "
-                     "%s, summary %s **",
-                     expr_result.GetValue(), expr_result.GetSummary());
+  LLDB_LOGF(expr_log,
+            "** [SBFrame::EvaluateExpression] Expression result is "
+            "%s, summary %s **",
+            expr_result.GetValue(), expr_result.GetSummary());
 
   return LLDB_RECORD_RESULT(expr_result);
 }