[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
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.cpp
index 631c15c..1e39ff1 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.cpp
@@ -64,9 +64,10 @@
                                            lldb::addr_t impl_addr) {
   Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
   if (log) {
-    log->Printf("Caching: class 0x%" PRIx64 " selector 0x%" PRIx64
-                " implementation 0x%" PRIx64 ".",
-                class_addr, selector, impl_addr);
+    LLDB_LOGF(log,
+              "Caching: class 0x%" PRIx64 " selector 0x%" PRIx64
+              " implementation 0x%" PRIx64 ".",
+              class_addr, selector, impl_addr);
   }
   m_impl_cache.insert(std::pair<ClassAndSel, lldb::addr_t>(
       ClassAndSel(class_addr, selector), impl_addr));