Skip declarations in ResourceAllocator

FunctionsInfo metadata can contain declarations
(functions with no body). When ResourceAllocator calls
getAnalysis<ExtensionArgAnalysis>(F) on a declaration,                                                                         LLVM's FPPassManager skips it, so the analysis never runs and
findAnalysisPass returns nullptr, triggering an assert.
Skip declarations in the runOnModule loop.

Author: fda0

IGC/Compiler/Optimizer/OpenCLPasses/ResourceAllocator/ResourceAllocator.cpp

@@ -57,6 +57,8 @@ bool ResourceAllocator::runOnModule(Module &M) {
   MetaDataUtils *pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
   // FunctionsInfo contains kernels only.
   for (auto i = pMdUtils->begin_FunctionsInfo(), e = pMdUtils->end_FunctionsInfo(); i != e; ++i) {
+    if (i->first->isDeclaration())
+      continue;
     runOnFunction(*(i->first));
   }