[llvm] [SeparateConstOffsetFromGEP] Don't set unsound inbounds flag (PR #130616)

[Matt Arsenault via llvm-commits]

================
@@ -228,6 +228,9 @@ define amdgpu_vs i32 @load_i32_hifffffff0(ptr addrspace(6) inreg %p) #4 {
 ; GCN: v_readfirstlane_b32
----------------
arsenm wrote:

The test is certainly too big and not targeted, but probably should adjust the input if possible to preserve whatever folding happened before 

https://github.com/llvm/llvm-project/pull/130616