[CodeView] Recognize Fortran95 as Fortran instead of MASM

Map Fortran95 sources to Fortran so the CodeView language is not emitted as
MASM.

Differential Revision: https://reviews.llvm.org/D110330

llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp

@@ -746,6 +746,7 @@ static SourceLanguage MapDWLangToCVLang(unsigned DWLang) {
     return SourceLanguage::Cpp;
   case dwarf::DW_LANG_Fortran77:
   case dwarf::DW_LANG_Fortran90:
+  case dwarf::DW_LANG_Fortran95:
   case dwarf::DW_LANG_Fortran03:
   case dwarf::DW_LANG_Fortran08:
     return SourceLanguage::Fortran;

llvm/test/DebugInfo/COFF/language.ll

@@ -0,0 +1,67 @@
+; RUN: sed -e 's/<LANG1>/DW_LANG_C/;s/<LANG2>/C/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_C89/;s/<LANG2>/C/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_C99/;s/<LANG2>/C/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_C11/;s/<LANG2>/C/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_C_plus_plus/;s/<LANG2>/Cpp/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_C_plus_plus_03/;s/<LANG2>/Cpp/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_C_plus_plus_11/;s/<LANG2>/Cpp/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_C_plus_plus_14/;s/<LANG2>/Cpp/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_Fortran77/;s/<LANG2>/Fortran/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_Fortran90/;s/<LANG2>/Fortran/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_Fortran95/;s/<LANG2>/Fortran/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_Fortran03/;s/<LANG2>/Fortran/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+;
+; RUN: sed -e 's/<LANG1>/DW_LANG_Fortran08/;s/<LANG2>/Fortran/' %s > %t
+; RUN: llc -filetype=obj -o - %t | llvm-readobj --codeview - | FileCheck %t
+
+; CHECK:      CodeViewDebugInfo [
+; CHECK:        Subsection [
+; CHECK:          SubSectionType: Symbols (0xF1)
+; CHECK:          Compile3Sym {
+; CHECK-NEXT:        Kind: S_COMPILE3 (0x113C)
+; CHECK-NEXT:        Language: <LANG2>
+; CHECK-NEXT:        Flags [ (0x0)
+; CHECK-NEXT:        ]
+; CHECK-NEXT:        Machine: X64 (0xD0)
+; CHECK-NEXT:        FrontendVersion: {{[0-9.]*}}
+; CHECK-NEXT:        BackendVersion: {{[0-9.]*}}
+; CHECK-NEXT:        VersionName: clang
+; CHECK-NEXT:     }
+; CHECK:        ]
+; CHECK:      ]
+
+; ModuleID = 'empty'
+source_filename = "empty"
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc19.0.24215"
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!2, !3}
+
+!0 = distinct !DICompileUnit(language: <LANG1>, file: !1, producer: "clang")
+!1 = !DIFile(filename: "empty", directory: "path/to")
+!2 = !{i32 2, !"CodeView", i32 1}
+!3 = !{i32 2, !"Debug Info Version", i32 3}