[llvm] [MC] output inlined-at debug info (PR #106230)

[Yaxun Liu via llvm-commits]

================
@@ -2056,6 +2056,14 @@ void DwarfDebug::beginInstruction(const MachineInstr *MI) {
     }
   }
 
+  auto RecordSourceLine = [&](auto &DL, auto Flags) {
+    SmallString<128> LocationString;
+    raw_svector_ostream OS(LocationString);
+    DL.print(OS);
+
+    const MDNode *Scope = DL.getScope();
+    recordSourceLine(DL.getLine(), DL.getCol(), Scope, Flags, LocationString);
----------------
yxsamliu wrote:

There are places that emits artificial source locations which have no corresponding DebugLoc. Changing the argument of recordSourceLine to DebugLoc would requires creating temporary DebugLoc's on the fly, which requires creating DILocation's on the fly. Considering large number of source locations, doing this could incur considerable overhead.

https://github.com/llvm/llvm-project/pull/106230