[AsmPrinter] Enable codeview for windows-itanium

[smeenai]

Summary

Enable codeview emission for windows-itanium targets. Co-opt an existing
test (which is derived from a C source file and should therefore be
identical across the Itanium and MS ABIs).

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

if (!M.getModuleInlineAsm().empty()) {
     EmitInlineAsm(M.getModuleInlineAsm()+"\n",
                   OutContext.getSubtargetCopy(*STI), TM.Options.MCOptions);
     OutStreamer->AddComment("End of file scope inline assembly");
     OutStreamer->AddBlankLine();
   }
 
   if (MAI->doesSupportDebugInformation()) {
     bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
-    if (EmitCodeView && TM.getTargetTriple().isKnownWindowsMSVCEnvironment()) {
+    if (EmitCodeView && (TM.getTargetTriple().isKnownWindowsMSVCEnvironment() ||
+                         TM.getTargetTriple().isWindowsItaniumEnvironment())) {
       Handlers.push_back(HandlerInfo(new CodeViewDebug(this),
                                      DbgTimerName,
                                      CodeViewLineTablesGroupName));
     }
     if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
       DD = new DwarfDebug(this, &M);
       DD->beginModule();
       Handlers.push_back(HandlerInfo(DD, DbgTimerName, DWARFGroupName));

test/DebugInfo/COFF/simple.ll

 ; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -O0 < %s | FileCheck --check-prefix=X86 %s
+; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32-itanium -O0 < %s | FileCheck --check-prefix=X86 %s
 ; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32 -o - -O0 < %s | llvm-mc -triple=i686-pc-win32 -filetype=obj | llvm-readobj -s -sr -codeview -section-symbols | FileCheck --check-prefix=OBJ32 %s
+; RUN: llc -mcpu=core2 -mtriple=i686-pc-win32-itanium -o - -O0 < %s | llvm-mc -triple=i686-pc-win32 -filetype=obj | llvm-readobj -s -sr -codeview -section-symbols | FileCheck --check-prefix=OBJ32 %s
 ; RUN: llc -mcpu=core2 -mtriple=x86_64-pc-win32 -O0 < %s | FileCheck --check-prefix=X64 %s
+; RUN: llc -mcpu=core2 -mtriple=x86_64-pc-win32-itanium -O0 < %s | FileCheck --check-prefix=X64 %s
 ; RUN: llc -mcpu=core2 -mtriple=x86_64-pc-win32 -o - -O0 < %s | llvm-mc -triple=x86_64-pc-win32 -filetype=obj | llvm-readobj -s -sr -codeview -section-symbols | FileCheck --check-prefix=OBJ64 %s
+; RUN: llc -mcpu=core2 -mtriple=x86_64-pc-win32-itanium -o - -O0 < %s | llvm-mc -triple=x86_64-pc-win32 -filetype=obj | llvm-readobj -s -sr -codeview -section-symbols | FileCheck --check-prefix=OBJ64 %s
 
 ; This LL file was generated by running clang on the following code:
 ; D:\test.c:
 ; 1 void g(void);
 ; 2
 ; 3 void f(void) {
 ; 4   g();
 ; 5 }