Fix infinite loop when block has multiple params for sort_by etc

[pvcresin]

This PR fixes an infinite loop that occurs when a multi-parameter block is passed to methods like sort_by.

Reproduction

The following code causes the analysis to hang.

def OK_1
  { a: 1 }.sort_by do |key_value|
    key_value
  end
end

def OK_2
  { a: 1 }.sort_by do |(key, value)|
    key
  end
end

def NG
  { a: 1 }.sort_by do |key, value|
    key
  end
end

Approach

SplatBox creation is moved from the run phase (Block#accept_args) to the install phase (CallBaseNode#install0), and accept_args now just connects an edge to the pre-existing @f_ary_arg vertex. This keeps the graph structure stable across re-runs and prevents the infinite loop caused by typecheck trigger edges.

[mame]

👏

[mame]

Thank you!