fix failing CI

I used llvm 16 and updated the reference tests

Author: Vipul-Cariappa

tests/reference/llvm_dbg-expr_01-9fc5f30.json

@@ -6,7 +6,7 @@
     "outfile": null,
     "outfile_hash": null,
     "stdout": "llvm_dbg-expr_01-9fc5f30.stdout",
-    "stdout_hash": "05da15be1ee079ac286df323e40803c05309df3355abf9f08f26413e",
+    "stdout_hash": "70643017f0ad204393988f111369cdd921c1c297149078182707cb54",
     "stderr": null,
     "stderr_hash": null,
     "returncode": 0

tests/reference/llvm_dbg-expr_01-9fc5f30.stdout

@@ -5,7 +5,7 @@ source_filename = "LFortran"
 @1 = private unnamed_addr constant [2 x i8] c"\0A\00", align 1
 @2 = private unnamed_addr constant [5 x i8] c"%d%s\00", align 1
 
-define void @__module___main_____main__global_stmts() !dbg !2 {
+define void @__module___main_____main__global_stmts() !dbg !3 {
 .entry:
   call void @__module___main___main0(), !dbg !6
   br label %return, !dbg !6
@@ -33,7 +33,7 @@ return:                                           ; preds = %.entry
   ret void, !dbg !21
 }
 
-; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
+; Function Attrs: nounwind readnone speculatable willreturn
 declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
 
 declare void @_lfortran_printf(i8*, ...)
@@ -47,18 +47,18 @@ define i32 @main(i32 %0, i8** %1) !dbg !22 {
 
 declare void @_lpython_call_initial_functions(i32, i8**)
 
-attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
+attributes #0 = { nounwind readnone speculatable willreturn }
 
 !llvm.dbg.cu = !{!0}
 
-!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "LPython Compiler", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "LPython Compiler", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
 !1 = !DIFile(filename: "tests/expr_01.py", directory: ".")
-!2 = distinct !DISubprogram(name: "__main__global_stmts", scope: !1, file: !1, line: 1, type: !3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !5)
-!3 = !DISubroutineType(types: !4)
-!4 = !{null}
-!5 = !{}
-!6 = !DILocation(line: 9, column: 1, scope: !2)
-!7 = distinct !DISubprogram(name: "main0", scope: !1, file: !1, line: 1, type: !3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !5)
+!2 = !{}
+!3 = distinct !DISubprogram(name: "__main__global_stmts", scope: !1, file: !1, line: 1, type: !4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
+!4 = !DISubroutineType(types: !5)
+!5 = !{null}
+!6 = !DILocation(line: 9, column: 1, scope: !3)
+!7 = distinct !DISubprogram(name: "main0", scope: !1, file: !1, line: 1, type: !4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
 !8 = !DILocation(line: 1, column: 1, scope: !7)
 !9 = !DILocalVariable(name: "x", arg: 1, scope: !7, file: !1, line: 2, type: !10)
 !10 = !DIBasicType(name: "integer", size: 32, encoding: DW_ATE_signed)
@@ -73,7 +73,7 @@ attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memo
 !19 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
 !20 = !DILocation(line: 5, scope: !7)
 !21 = !DILocation(line: 6, column: 5, scope: !7)
-!22 = distinct !DISubprogram(name: "main_program", scope: !1, file: !1, line: 1, type: !23, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !5)
+!22 = distinct !DISubprogram(name: "main_program", scope: !1, file: !1, line: 1, type: !23, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
 !23 = !DISubroutineType(types: !24)
 !24 = !{!10}
 !25 = !DILocation(line: 1, column: 1, scope: !22)