[SampleProfile] Skip intrinsic calls when visiting callsites in InlineHotFunctions.

Before this patch, we always called method 'findCalleeFunctionSamples()' on
intrinsic calls. However, intrinsic calls like llvm.dbg.value() are not viable
candidates for obvious reasons.

No functional change intended.

Differential Revision: https://reviews.llvm.org/D32008

llvm-svn: 300541

llvm/lib/Transforms/IPO/SampleProfile.cpp

@@ -677,7 +677,7 @@ bool SampleProfileLoader::inlineHotFunctions(
       for (auto &I : BB.getInstList()) {
         const FunctionSamples *FS = nullptr;
         if ((isa<CallInst>(I) || isa<InvokeInst>(I)) &&
-            (FS = findCalleeFunctionSamples(I))) {
+            !isa<IntrinsicInst>(I) && (FS = findCalleeFunctionSamples(I))) {
           Candidates.push_back(&I);
           if (callsiteIsHot(Samples, FS))
             Hot = true;