SampleProfileLoader::inlineHotFunctionsWithPriority - Fix uninitialized variable warning. NFCI.

findIndirectCallFunctionSamples will leave Sum uninitialized if it returns an empty vector, we don't really use Sum in this case (but we do make a copy that isn't used either) - so ensure we initialize the value to zero to at least silence the static analysis warning.

llvm/lib/Transforms/IPO/SampleProfile.cpp

@@ -1345,7 +1345,7 @@ bool SampleProfileLoader::inlineHotFunctionsWithPriority(
     if (CalledFunction == &F)
       continue;
     if (I->isIndirectCall()) {
-      uint64_t Sum;
+      uint64_t Sum = 0;
       auto CalleeSamples = findIndirectCallFunctionSamples(*I, Sum);
       uint64_t SumOrigin = Sum;
       Sum *= Candidate.CallsiteDistribution;