…lue (#8468)

Previously, boolean literals were processed in a separate loop after
valueFlowSetConstantValue. This triggered nullPointer FP with code such
as:

int f() {
    const int* p = true ? new int() : nullptr;
    return *p; // nullPointer FP
}

Because the condition token had no known value, both branches of the
ternary operator were treated as possible, leaking a spurious null
value.

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Signed-off-by: Francois Berder <fberder@outlook.fr>