[mlir][debug] Inherit DISubprogramAttr from DILocalScopeAttr. (#156081)

As mentioned in #154926,
`DISubprogramAttr` is inherited from `DIScopeAttr` while in llvm, the
`DISubprogram` inherits from `DILocalScope`. This change corrects the
hierarchy.

Also does the same change for `DILexicalBlockAttr` and `DILexicalBlockFileAttr`.

Author: abidh

mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td

@@ -590,7 +590,7 @@ def LLVM_DIGlobalVariable : LLVM_Attr<"DIGlobalVariable", "di_global_variable",
 //===----------------------------------------------------------------------===//
 
 def LLVM_DILexicalBlockAttr : LLVM_Attr<"DILexicalBlock", "di_lexical_block",
-                                        /*traits=*/[], "DIScopeAttr"> {
+                                        /*traits=*/[], "DILocalScopeAttr"> {
   let parameters = (ins
     "DIScopeAttr":$scope,
     OptionalParameter<"DIFileAttr">:$file,
@@ -616,7 +616,7 @@ def LLVM_DILexicalBlockAttr : LLVM_Attr<"DILexicalBlock", "di_lexical_block",
 //===----------------------------------------------------------------------===//
 
 def LLVM_DILexicalBlockFile : LLVM_Attr<"DILexicalBlockFile", "di_lexical_block_file",
-                                        /*traits=*/[], "DIScopeAttr"> {
+                                        /*traits=*/[], "DILocalScopeAttr"> {
   let parameters = (ins
     "DIScopeAttr":$scope,
     OptionalParameter<"DIFileAttr">:$file,
@@ -674,7 +674,7 @@ def LLVM_DILocalVariableAttr : LLVM_Attr<"DILocalVariable", "di_local_variable",
 
 def LLVM_DISubprogramAttr : LLVM_Attr<"DISubprogram", "di_subprogram",
                                       [LLVM_DIRecursiveTypeAttrInterface],
-                                      "DIScopeAttr"> {
+                                      "DILocalScopeAttr"> {
   let parameters = (ins
     // DIRecursiveTypeAttrInterface specific parameters.
     OptionalParameter<"DistinctAttr">:$recId,

mlir/lib/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.cpp

@@ -362,7 +362,8 @@ static void convertModuleFlagsOp(ArrayAttr flags, llvm::IRBuilderBase &builder,
 static llvm::DILocalScope *
 getLocalScopeFromLoc(llvm::IRBuilderBase &builder, Location loc,
                      LLVM::ModuleTranslation &moduleTranslation) {
-  if (auto scopeLoc = loc->findInstanceOf<FusedLocWith<LLVM::DIScopeAttr>>())
+  if (auto scopeLoc =
+          loc->findInstanceOf<FusedLocWith<LLVM::DILocalScopeAttr>>())
     if (auto *localScope = llvm::dyn_cast<llvm::DILocalScope>(
             moduleTranslation.translateDebugInfo(scopeLoc.getMetadata())))
       return localScope;