Fix codegen test on debug version

[inkydragon]

xref: #46064

• Fix the name of the libjulia-codegen library in the debug version
• skip some llvm codegen test

reproduction steps

make -j `nproc`  debug
make -C test/  compiler/codegen debug

get_llvm test

using InteractiveUtils
using Test

const opt_level = Base.JLOptions().opt_level

# `_dump_function` might be more efficient but it doesn't really matter here...
get_llvm(@nospecialize(f), @nospecialize(t), raw=true, dump_module=false, optimize=true) =
    sprint(code_llvm, f, t, raw, dump_module, optimize)

get_llvm(identity, Tuple{String}) |> print
if opt_level > 0
    # Make sure getptls call is removed at IR level with optimization on
    @test !occursin(" call ", get_llvm(identity, Tuple{String}))
end

In the debug version, the @test fails because the output of llvm contains the string "call".
For now I'm just skipping them in the debug version. Maybe there is a better solution.

julia> get_llvm(identity, Tuple{String}) |> print
;  @ operators.jl:513 within `identity`
; Function Attrs: sspstrong
define nonnull {} addrspace(10)* @julia_identity_55({} addrspace(10)* noundef nonnull %0) #0 !dbg !5 {
top:
;  @ operators.jl within `identity`
  call void @llvm.dbg.value(metadata {} addrspace(10)* null, metadata !17, metadata !DIExpression(DW_OP_deref)), !dbg !18
  call void @llvm.dbg.value(metadata {} addrspace(10)* %0, metadata !17, metadata !DIExpression(DW_OP_deref)), !dbg !18
;  @ operators.jl:513 within `identity`
  ret {} addrspace(10)* %0, !dbg !19
}