[XRay] Emit absolute address for versions less than 2

[SixWeining]

Summary

D78082 changed the absolute address to a PC-relative address if version
is not less than 2. But it didn't differentiate versions when emitting
the xray table in AsmPrinter. This patch handles it.

[MaskRay]

We should not add more code for legacy version 1. I sent D140739 to remove the runtime side code.

[SixWeining]

In D140725#4018820, @MaskRay wrote:

We should not add more code for legacy version 1. I sent D140739 to remove the runtime side code.

Thanks. Let me abandon this change.

llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp

void AsmPrinter::emitXRayTable() {
   // Now we switch to the instrumentation map section. Because this is done
   // per-function, we are able to create an index entry that will represent the
   // range of sleds associated with a function.
   auto &Ctx = OutContext;
   MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
   OutStreamer->switchSection(InstMap);
   OutStreamer->emitLabel(SledsStart);
   for (const auto &Sled : Sleds) {
+    if (Sled.Version >= 2) {
       MCSymbol *Dot = Ctx.createTempSymbol();
       OutStreamer->emitLabel(Dot);
       OutStreamer->emitValueImpl(
           MCBinaryExpr::createSub(MCSymbolRefExpr::create(Sled.Sled, Ctx),
                                   MCSymbolRefExpr::create(Dot, Ctx), Ctx),
           WordSizeBytes);
       OutStreamer->emitValueImpl(
           MCBinaryExpr::createSub(
               MCSymbolRefExpr::create(CurrentFnBegin, Ctx),
-            MCBinaryExpr::createAdd(MCSymbolRefExpr::create(Dot, Ctx),
-                                    MCConstantExpr::create(WordSizeBytes, Ctx),
-                                    Ctx),
+              MCBinaryExpr::createAdd(
+                  MCSymbolRefExpr::create(Dot, Ctx),
+                  MCConstantExpr::create(WordSizeBytes, Ctx), Ctx),
               Ctx),
           WordSizeBytes);
+    } else {
+      OutStreamer->emitSymbolValue(Sled.Sled, WordSizeBytes);
+      OutStreamer->emitSymbolValue(Sled.Function, WordSizeBytes);
+    }
     Sled.emit(WordSizeBytes, OutStreamer.get());
   }
   MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
   OutStreamer->emitLabel(SledsEnd);
 
   // We then emit a single entry in the index per function. We use the symbols
   // that bound the instrumentation map as the range for a specific function.
   // Each entry here will be 2 * word size aligned, as we're writing down two