[llvm] [NFC][AsmPrinter] Clean up stale comments (PR #71736)

[Scott Linder via llvm-commits]

https://github.com/slinder1 created https://github.com/llvm/llvm-project/pull/71736

The first comment seems to have survived https://reviews.llvm.org/D4919
by accident, and no longer has any meaning.

The second is now imprecise, as more than just DBG_VALUE have already
been considered by this point in the function.


>From 30fbba91ce82b68395b0b527ff0f34d349e6a010 Mon Sep 17 00:00:00 2001
From: Scott Linder <Scott.Linder at amd.com>
Date: Wed, 8 Nov 2023 21:05:35 +0000
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
 =?UTF-8?q?l=20version?=
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Created using spr 1.3.6-beta.1
---
 llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp b/llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp
index 55a0afcf7a33f16..dab27d209d18fd6 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp
@@ -466,9 +466,6 @@ void llvm::calculateDbgEntityHistory(const MachineFunction *MF,
     for (const auto &MI : MBB) {
       if (MI.isDebugValue()) {
         assert(MI.getNumOperands() > 1 && "Invalid DBG_VALUE instruction!");
-        // Use the base variable (without any DW_OP_piece expressions)
-        // as index into History. The full variables including the
-        // piece expressions are attached to the MI.
         const DILocalVariable *RawVar = MI.getDebugVariable();
         assert(RawVar->isValidLocationForIntrinsic(MI.getDebugLoc()) &&
                "Expected inlined-at fields to agree");
@@ -492,8 +489,7 @@ void llvm::calculateDbgEntityHistory(const MachineFunction *MF,
       if (MI.isMetaInstruction())
         continue;
 
-      // Not a DBG_VALUE instruction. It may clobber registers which describe
-      // some variables.
+      // Other instruction may clobber registers which describe some variables.
       for (const MachineOperand &MO : MI.operands()) {
         if (MO.isReg() && MO.isDef() && MO.getReg()) {
           // Ignore call instructions that claim to clobber SP. The AArch64