@which 2^(-1) directs to incorrect method

[putianyi889]

julia> 2^(-1)
0.5

julia> @which 2^(-1)
^(x::T, p::T) where T<:Integer
     @ Base intfuncs.jl:310

julia/base/intfuncs.jl

Line 348 in 1ba83f0

^(x::T, p::T) where {T<:Integer} = power_by_squaring(x,p)

julia> Base.power_by_squaring(2,-1)
ERROR: DomainError with -1:
Cannot raise an integer x to a negative power -1.
Make x or -1 a float by adding a zero decimal (e.g., 2.0^-1 or 2^-1.0 instead of 2^-1)or write 1/x^1, float(x)^-1, x^float(-1) or (x//1)^-1.
Stacktrace:
 [1] throw_domerr_powbysq(::Int64, p::Int64)
   @ Base .\intfuncs.jl:265
 [2] power_by_squaring(x_::Int64, p::Int64)
   @ Base .\intfuncs.jl:286
 [3] top-level scope
   @ REPL[79]:1

It's because 2^(-1) is done through literal_pow.

@code_lowered and @less have the same problem.

julia> @code_lowered 2^(-1)
CodeInfo(
1 ─ %1 = Base.power_by_squaring(x, p)
└──      return %1
)

[thofma]

Dup of #21014?