[llvm] [CodeGen] Remove getSubReg from TargetRegisterInfo. NFC (PR #127680)

[Craig Topper via llvm-commits]

https://github.com/topperc created https://github.com/llvm/llvm-project/pull/127680

Users can use the version inherited from MCRegisterInfo.

This version was added by e7694f34ab6a1 to return a Register. It was later changed to return MCRegister by bab72dd5d5122 making it identical MCRegisterInfo.

>From 6636d382111766f535392b851253c45793028eae Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Tue, 18 Feb 2025 10:22:30 -0800
Subject: [PATCH] [CodeGen] Remove getSubReg from TargetRegisterInfo. NFC

Users can use the version inherited from MCRegisterInfo.

This version was added by e7694f34ab6a1 to return a Register. It
later changed to MCRegister by bab72dd5d5122 making it identical
MCRegisterInfo.
---
 llvm/include/llvm/CodeGen/TargetRegisterInfo.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/llvm/include/llvm/CodeGen/TargetRegisterInfo.h b/llvm/include/llvm/CodeGen/TargetRegisterInfo.h
index 66fd3fb9b0526..79f014edb58c8 100644
--- a/llvm/include/llvm/CodeGen/TargetRegisterInfo.h
+++ b/llvm/include/llvm/CodeGen/TargetRegisterInfo.h
@@ -1232,13 +1232,6 @@ class TargetRegisterInfo : public MCRegisterInfo {
     return nullptr;
   }
 
-  /// Returns the physical register number of sub-register "Index"
-  /// for physical register RegNo. Return zero if the sub-register does not
-  /// exist.
-  inline MCRegister getSubReg(MCRegister Reg, unsigned Idx) const {
-    return static_cast<const MCRegisterInfo *>(this)->getSubReg(Reg, Idx);
-  }
-
   /// Some targets have non-allocatable registers that aren't technically part
   /// of the explicit callee saved register list, but should be handled as such
   /// in certain cases.