[clang] [clang][bytecode] Remove InterpFrame::IsBottom flag (PR #159279)

[Timm Baeder via cfe-commits]

https://github.com/tbaederr created https://github.com/llvm/llvm-project/pull/159279

The bottom frame is the one without a parent. No need to save that information separately.

>From 89660bb96ee87cfd7634765a44c220b85702f201 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder at redhat.com>
Date: Wed, 17 Sep 2025 10:08:05 +0200
Subject: [PATCH] [clang][bytecode] Remove InterpFrame::IsBottom flag

The bottom frame is the one without a parent. No need to save that
information separately.
---
 clang/lib/AST/ByteCode/InterpFrame.cpp | 4 ++--
 clang/lib/AST/ByteCode/InterpFrame.h   | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/clang/lib/AST/ByteCode/InterpFrame.cpp b/clang/lib/AST/ByteCode/InterpFrame.cpp
index b9dc2aed23113..c411a371282ef 100644
--- a/clang/lib/AST/ByteCode/InterpFrame.cpp
+++ b/clang/lib/AST/ByteCode/InterpFrame.cpp
@@ -24,13 +24,13 @@ using namespace clang::interp;
 
 InterpFrame::InterpFrame(InterpState &S)
     : Caller(nullptr), S(S), Depth(0), Func(nullptr), RetPC(CodePtr()),
-      ArgSize(0), Args(nullptr), FrameOffset(0), IsBottom(true) {}
+      ArgSize(0), Args(nullptr), FrameOffset(0) {}
 
 InterpFrame::InterpFrame(InterpState &S, const Function *Func,
                          InterpFrame *Caller, CodePtr RetPC, unsigned ArgSize)
     : Caller(Caller), S(S), Depth(Caller ? Caller->Depth + 1 : 0), Func(Func),
       RetPC(RetPC), ArgSize(ArgSize), Args(static_cast<char *>(S.Stk.top())),
-      FrameOffset(S.Stk.size()), IsBottom(!Caller) {
+      FrameOffset(S.Stk.size()) {
   if (!Func)
     return;
 
diff --git a/clang/lib/AST/ByteCode/InterpFrame.h b/clang/lib/AST/ByteCode/InterpFrame.h
index cf4d27d341e91..129851155bd86 100644
--- a/clang/lib/AST/ByteCode/InterpFrame.h
+++ b/clang/lib/AST/ByteCode/InterpFrame.h
@@ -129,7 +129,7 @@ class InterpFrame final : public Frame {
 
   bool isStdFunction() const;
 
-  bool isBottomFrame() const { return IsBottom; }
+  bool isBottomFrame() const { return !Caller; }
 
   void dump() const { dump(llvm::errs(), 0); }
   void dump(llvm::raw_ostream &OS, unsigned Indent = 0) const;
@@ -179,7 +179,6 @@ class InterpFrame final : public Frame {
   const size_t FrameOffset;
   /// Mapping from arg offsets to their argument blocks.
   llvm::DenseMap<unsigned, std::unique_ptr<char[]>> Params;
-  bool IsBottom = false;
 };
 
 } // namespace interp