[Orc][Coff] Skip registration of voltbl sections

We're getting asserts for duplicate section registration during
linking which stems back to these sections. From previous
discussions, it seems like these are metadata sections that can
be dropped. See the discussion in D116474 and
https://bugs.llvm.org/show_bug.cgi?id=45111.

Differential Revision: https://reviews.llvm.org/D152574

llvm/lib/ExecutionEngine/JITLink/COFFLinkGraphBuilder.cpp

@@ -135,6 +135,13 @@ Error COFFLinkGraphBuilder::graphifySections() {
       SectionName = *SecNameOrErr;
 
     // FIXME: Skip debug info sections
+    if (SectionName == ".voltbl") {
+      LLVM_DEBUG({
+        dbgs() << "    "
+               << "Skipping section \"" << SectionName << "\"\n";
+      });
+      continue;
+    }
 
     LLVM_DEBUG({
       dbgs() << "    "

llvm/lib/ExecutionEngine/JITLink/COFFLinkGraphBuilder.h

@@ -193,6 +193,10 @@ Error COFFLinkGraphBuilder::forEachRelocation(const object::SectionRef &RelSec,
   Expected<StringRef> Name = Obj.getSectionName(COFFRelSect);
   if (!Name)
     return Name.takeError();
+
+  // Skip the unhandled metadata sections.
+  if (*Name == ".voltbl")
+    return Error::success();
   LLVM_DEBUG(dbgs() << "  " << *Name << ":\n");
 
   // Lookup the link-graph node corresponding to the target section name.