Have the skeleton compile unit construction method take the CU it

is constructing from as an input and keep the same unique identifier.
We can use this to connect items which must stay in the .o file
(e.g. pubnames and pubtypes) to the skeleton cu rather than having
duplicate unique numbers for the sections and needing to do lookups
based on MDNode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189293 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -1032,7 +1032,7 @@ void DwarfDebug::finalizeModuleInfo() {
       TheCU->addUInt(TheCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
                      dwarf::DW_FORM_data8, ID);
       // Now construct the skeleton CU associated.
-      CompileUnit *SkCU = constructSkeletonCU(CUI->first);
+      CompileUnit *SkCU = constructSkeletonCU(TheCU);
       // This should be a unique identifier when we want to build .dwp files.
       SkCU->addUInt(SkCU->getCUDie(), dwarf::DW_AT_GNU_dwo_id,
                     dwarf::DW_FORM_data8, ID);
@@ -2685,12 +2685,12 @@ void DwarfDebug::emitDebugInlineInfo() {
 // DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges, DW_AT_dwo_name, DW_AT_dwo_id,
 // DW_AT_ranges_base, DW_AT_addr_base. If DW_AT_ranges is present,
 // DW_AT_low_pc and DW_AT_high_pc are not used, and vice versa.
-CompileUnit *DwarfDebug::constructSkeletonCU(const MDNode *N) {
-  DICompileUnit DIUnit(N);
+CompileUnit *DwarfDebug::constructSkeletonCU(const CompileUnit *CU) {
+  DICompileUnit DIUnit(CU->getNode());
 
   DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
-  CompileUnit *NewCU =
-      new CompileUnit(GlobalCUIndexCount++, Die, N, Asm, this, &SkeletonHolder);
+  CompileUnit *NewCU = new CompileUnit(CU->getUniqueID(), Die, CU->getNode(),
+                                       Asm, this, &SkeletonHolder);
 
   NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name,
                         DIUnit.getSplitDebugFilename());

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -559,7 +559,7 @@ class DwarfDebug {
 
   /// \brief Construct the split debug info compile unit for the debug info
   /// section.
-  CompileUnit *constructSkeletonCU(const MDNode *);
+  CompileUnit *constructSkeletonCU(const CompileUnit *CU);
 
   /// \brief Emit the local split abbreviations.
   void emitSkeletonAbbrevs(const MCSection *);