Set VMA to code address in PerfJITEventListener

[pchintalapudi]

Summary

VMA should default to CodeAddr, not 0, as specified here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Documentation/jitdump-specification.txt

[lhames]

LGTM.

llvm/lib/ExecutionEngine/PerfJITEvents/PerfJITEventListener.cpp

void PerfJITEventListener::NotifyCode(Expected<llvm::StringRef> &Symbol,
   LLVMPerfJitRecordCodeLoad rec;
   rec.Prefix.Id = JIT_CODE_LOAD;
   rec.Prefix.TotalSize = sizeof(rec) +        // debug record itself
                          Symbol->size() + 1 + // symbol name
                          CodeSize;            // and code
   rec.Prefix.Timestamp = perf_get_timestamp();
 
   rec.CodeSize = CodeSize;
-  rec.Vma = 0;
+  rec.Vma = CodeAddr;
   rec.CodeAddr = CodeAddr;
   rec.Pid = Pid;
   rec.Tid = get_threadid();
 
   // avoid interspersing output
   std::lock_guard<sys::Mutex> Guard(Mutex);
 
   rec.CodeIndex = CodeGeneration++; // under lock!