Propagate the DWARF version from the main compiler invocation to PCHC… (llvm#66032)

…ontainerGenerator Currently it remains uninitialized and thus always uses the LLVM default of 4.

Author: adrian-prantl

clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp

@@ -160,6 +160,7 @@ class PCHContainerGenerator : public ASTConsumer {
  LangOpts.CurrentModule.empty() ? MainFileName : LangOpts.CurrentModule;
  CodeGenOpts.setDebugInfo(llvm::codegenoptions::FullDebugInfo);
  CodeGenOpts.setDebuggerTuning(CI.getCodeGenOpts().getDebuggerTuning());
+ CodeGenOpts.DwarfVersion = CI.getCodeGenOpts().DwarfVersion;
  CodeGenOpts.DebugPrefixMap =
  CI.getInvocation().getCodeGenOpts().DebugPrefixMap;
  CodeGenOpts.DebugStrictDwarf = CI.getCodeGenOpts().DebugStrictDwarf;

clang/test/Modules/ModuleDebugInfo.cpp

@@ -6,10 +6,11 @@
 
 // Modules:
 // RUN: rm -rf %t
-// RUN: %clang_cc1 -triple %itanium_abi_triple -x objective-c++ -std=c++11 -debugger-tuning=lldb -debug-info-kind=limited -fmodules -fmodule-format=obj -fimplicit-module-maps -DMODULES -fmodules-cache-path=%t %s -I %S/Inputs -I %t -emit-llvm -o %t.ll -mllvm -debug-only=pchcontainer &>%t-mod.ll
+// RUN: %clang_cc1 -triple %itanium_abi_triple -x objective-c++ -std=c++11 -debugger-tuning=lldb -debug-info-kind=limited -dwarf-version=5 -fmodules -fmodule-format=obj -fimplicit-module-maps -DMODULES -fmodules-cache-path=%t %s -I %S/Inputs -I %t -emit-llvm -o %t.ll -mllvm -debug-only=pchcontainer &>%t-mod.ll
 // RUN: cat %t-mod.ll | FileCheck %s
 // RUN: cat %t-mod.ll | FileCheck --check-prefix=CHECK-NEG %s
 // RUN: cat %t-mod.ll | FileCheck --check-prefix=CHECK-MOD %s
+// RUN: cat %t-mod.ll | FileCheck --check-prefix=CHECK-MOD-DWARF %s
 
 // PCH:
 // RUN: %clang_cc1 -triple %itanium_abi_triple -x c++ -std=c++11 -debugger-tuning=lldb -emit-pch -fmodule-format=obj -I %S/Inputs -o %t.pch %S/Inputs/DebugCXX.h -mllvm -debug-only=pchcontainer &>%t-pch.ll
@@ -20,6 +21,8 @@
 @import DebugCXX;
 #endif
 
+// CHECK-MOD-DWARF: !"Dwarf Version", i32 5
+
 // CHECK-MOD: distinct !DICompileUnit(language: DW_LANG_{{.*}}C_plus_plus,
 // CHECK-MOD: distinct !DICompileUnit(language: DW_LANG_{{.*}}C_plus_plus,