Clean up debug logging

Summary:
We've had two ways to print a "debug" log message.
- Log::GetDebug() was testing a Stream flag which was never set.
- Log::Debug() was checking for the presence of "log enable --debug"
flag.

Given that these two were used very rarely and we already have a
different way to specify "I want a more verbose log", I propose to remove
these two functions and migrate the callers to LLDB_LOGV. This commit
does that.

Reviewers: clayborg, zturner

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D29823

llvm-svn: 294939
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
index 8f9e194..27cbf10 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
@@ -339,16 +339,16 @@
         lang_rt->GetOverrideExprOptions(m_compiler->getTargetOpts());
 
   if (overridden_target_opts)
-    if (log) {
-      log->Debug(
-          "Using overridden target options for the expression evaluation");
+    if (log && log->GetVerbose()) {
+      LLDB_LOGV(
+          log, "Using overridden target options for the expression evaluation");
 
       auto opts = m_compiler->getTargetOpts();
-      log->Debug("Triple: '%s'", opts.Triple.c_str());
-      log->Debug("CPU: '%s'", opts.CPU.c_str());
-      log->Debug("FPMath: '%s'", opts.FPMath.c_str());
-      log->Debug("ABI: '%s'", opts.ABI.c_str());
-      log->Debug("LinkerVersion: '%s'", opts.LinkerVersion.c_str());
+      LLDB_LOGV(log, "Triple: '{0}'", opts.Triple);
+      LLDB_LOGV(log, "CPU: '{0}'", opts.CPU);
+      LLDB_LOGV(log, "FPMath: '{0}'", opts.FPMath);
+      LLDB_LOGV(log, "ABI: '{0}'", opts.ABI);
+      LLDB_LOGV(log, "LinkerVersion: '{0}'", opts.LinkerVersion);
       StringList::LogDump(log, opts.FeaturesAsWritten, "FeaturesAsWritten");
       StringList::LogDump(log, opts.Features, "Features");
       StringList::LogDump(log, opts.Reciprocals, "Reciprocals");