[golang/go] x/tools/go/ssa: load-before-call ordering in return operands diverges from cmd/compile observable behavior

The issue arises because the SSA generation loads the state before the method call, capturing the old value. To fix this, the SSA should load the state after the method call to reflect the updated value. ### ROOT CAUSE The SSA incorrectly loads the state before the method call, resulting in the old value being returned instead of the updated one. ### CODE FIX Modify the SSA generation to load the state after the method call, ensuring the updated state is returned.

text
func f() (state, int):
0:                                                                entry P:0 S:0
	t0 = new state (x)                                               *state
	t1 = &t0.v [#0]                                                    *int
	*t1 = 1:int
	t2 = (*state).mutate(t0, 2:int)                                     int
	t3 = *t0                                                          state
	return t3, t2