[llvm] [NFC] [DirectX] Update DirectX codegen test `CBufferAccess/gep-ce-two-uses.ll` due to changes to ReplaceConstant (PR #169848)

[Deric C. via llvm-commits]

https://github.com/Icohedron created https://github.com/llvm/llvm-project/pull/169848

Fixes an LLVM DirectX codegen test after it broke due to #169141

The CBuffer loads and GEPs are no longer duplicated when in there are two or more accesses within the same basic block.
This PR removes the duplicate CBuffer load and GEP from the original test function `@f` and adds a new test function `@g` which places duplicate CBuffer loads into separate basic blocks.

>From 712ef0054f296752ea298cfe45166099452e3495 Mon Sep 17 00:00:00 2001
From: Deric Cheung <cheung.deric at gmail.com>
Date: Thu, 27 Nov 2025 10:10:48 -0800
Subject: [PATCH] Update test to accomodate lack of gep duplication within same
 basic block

---
 .../DirectX/CBufferAccess/gep-ce-two-uses.ll      | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/llvm/test/CodeGen/DirectX/CBufferAccess/gep-ce-two-uses.ll b/llvm/test/CodeGen/DirectX/CBufferAccess/gep-ce-two-uses.ll
index 4eda6353f47ed..751f1d3ebcfa9 100644
--- a/llvm/test/CodeGen/DirectX/CBufferAccess/gep-ce-two-uses.ll
+++ b/llvm/test/CodeGen/DirectX/CBufferAccess/gep-ce-two-uses.ll
@@ -21,6 +21,21 @@ entry:
   %a1 = load float, ptr addrspace(2) getelementptr inbounds nuw (i8, ptr addrspace(2) @a1, i32 16), align 4
   store float %a1, ptr %dst, align 32
 
+  %a2 = load float, ptr addrspace(2) getelementptr inbounds nuw (i8, ptr addrspace(2) @a1, i32 16), align 4
+  store float %a2, ptr %dst, align 32
+
+  ret void
+}
+
+define void @g(ptr %dst) {
+entry:
+  ; CHECK: [[PTR:%.*]] = call ptr addrspace(2) @llvm.dx.resource.getpointer.{{.*}}(target("dx.CBuffer", %__cblayout_CB) {{%.*}}, i32 0)
+  ; CHECK: getelementptr inbounds nuw i8, ptr addrspace(2) [[PTR]], i32 16
+  %a1 = load float, ptr addrspace(2) getelementptr inbounds nuw (i8, ptr addrspace(2) @a1, i32 16), align 4
+  store float %a1, ptr %dst, align 32
+  br label %next
+
+next:
   ; CHECK: [[PTR:%.*]] = call ptr addrspace(2) @llvm.dx.resource.getpointer.{{.*}}(target("dx.CBuffer", %__cblayout_CB) {{%.*}}, i32 0)
   ; CHECK: getelementptr inbounds nuw i8, ptr addrspace(2) [[PTR]], i32 16
   %a2 = load float, ptr addrspace(2) getelementptr inbounds nuw (i8, ptr addrspace(2) @a1, i32 16), align 4