[llvm] [AsmPrinter] Use DenseMap instead of MapVector (NFC) (PR #214256)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/214256

MBBSectionNumBlocks is accessed only via MapVector::operator[].

This patch changes its type to DenseMap to avoid populating the vector
portion of MapVector.


>From a7bf3e5fe1e640e0f6e7292bbf604fbabbed4d09 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Wed, 5 Aug 2026 07:53:21 -0700
Subject: [PATCH] [AsmPrinter] Use DenseMap instead of MapVector (NFC)

MBBSectionNumBlocks is accessed only via MapVector::operator[].

This patch changes its type to DenseMap to avoid populating the vector
portion of MapVector.
---
 llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 0580fc0f3a034..6b38991831c45 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1534,7 +1534,7 @@ void AsmPrinter::emitBBAddrMapSection(const MachineFunction &MF) {
     OutStreamer->emitULEB128IntValue(MBBSectionRanges.size());
   }
   // Number of blocks in each MBB section.
-  MapVector<MBBSectionID, unsigned> MBBSectionNumBlocks;
+  DenseMap<MBBSectionID, unsigned> MBBSectionNumBlocks;
   const MCSymbol *PrevMBBEndSymbol = nullptr;
   if (!Features.MultiBBRange) {
     OutStreamer->AddComment("function address");