[Clang][CodeGen]Remove anonymous tag locations

[yihanaa]

Summary

Remove anonymous tag locations, powered by 'PrintingPolicy', @aaron.ballman once suggested removing this extra information in https://reviews.llvm.org/D122248
struct:

struct S {
  int a;
  struct /* Anonymous*/ {
    int x;
  } b;
  int c;
};

Before:

struct S {
int a = 0
struct S::(unnamed at ./builtin_dump_struct.c:20:3) {
    int x = 0
    }
int c = 0
}

After:

struct S {
    int a = 0
    struct S::(unnamed) {
        int x = 0
    }
    int c = 0
}

[erichkeane]

I think Aaron wants release notes for just about everything :) Mind tossing one on this patch? I'll commit for you after that.

[yihanaa]

In D122670#3414549, @erichkeane wrote:

I think Aaron wants release notes for just about everything :) Mind tossing one on this patch? I'll commit for you after that.

Thanks @erichkeane ,i try to add this change into ReleaseNotes.😁

[yihanaa]

Add this change into ReleaseNotes.

[erichkeane]

Still LGTM.

[yihanaa]

In D122670#3414574, @erichkeane wrote:

Still LGTM.

Thank you! @erichkeane, I still need you to help me commit.😁

[erichkeane]

committed in: de7cd3ccf563847a24e04fb920cd0e3c310ba5bd

clang/docs/ReleaseNotes.rst

 - ``-Wunused-but-set-variable`` now also warns if the variable is only used
   by unary operators.
 
 Non-comprehensive list of changes in this release
 -------------------------------------------------
 - Improve __builtin_dump_struct:
   - Support bitfields in struct and union.
   - Improve the dump format, dump both bitwidth(if its a bitfield) and field value.
+  - Remove anonymous tag locations.
 
 New Compiler Flags
 ------------------
 
 Deprecated Compiler Flags
 -------------------------
 
 Modified Compiler Flags

clang/lib/CodeGen/CGBuiltin.cpp

 
 static llvm::Value *dumpRecord(CodeGenFunction &CGF, QualType RType,
                                LValue RecordLV, CharUnits Align,
                                llvm::FunctionCallee Func, int Lvl) {
   ASTContext &Context = CGF.getContext();
   RecordDecl *RD = RType->castAs<RecordType>()->getDecl()->getDefinition();
   std::string Pad = std::string(Lvl * 4, ' ');
 
+  PrintingPolicy Policy(Context.getLangOpts());
+  Policy.AnonymousTagLocations = false;
   Value *GString =
-      CGF.Builder.CreateGlobalStringPtr(RType.getAsString() + " {\n");
+      CGF.Builder.CreateGlobalStringPtr(RType.getAsString(Policy) + " {\n");
   Value *Res = CGF.Builder.CreateCall(Func, {GString});
 
   static llvm::DenseMap<QualType, const char *> Types;
   if (Types.empty()) {
     Types[Context.CharTy] = "%c";
     Types[Context.BoolTy] = "%d";
     Types[Context.SignedCharTy] = "%hhd";
     Types[Context.UnsignedCharTy] = "%hhu";