[PATCH] Add new debug kind LocTrackingOnly.

[David Blaikie]

================
Comment at: lib/Frontend/CompilerInvocation.cpp:569
@@ +568,3 @@
+      Opts.OptimizationRemarkAnalysisPattern) {
+    if (Opts.getDebugInfo() == CodeGenOptions::NoDebugInfo)
+      Opts.setDebugInfo(CodeGenOptions::LocTrackingOnly);
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You could roll these two 'if's together, if you like. (if ((x || y || z) && A == B)

Is there some more general check you could do for "OptimizationRemark" overall rather than having to check these 3 flags individually (& then have to update this ewhenever other similar flags are added?)

http://reviews.llvm.org/D4235