Fix safe-init error in MegaPhase #14464
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When bootstrapping the compiler with the `-Ysafe-init` flag, we would
get the following error:
```
[error] -- Error: /Users/rrampersad/Documents/school/URA/dotty/compiler/src/dotty/tools/dotc/transform/MegaPhase.scala:458:7
[error] 458 | for ((phase, idx) <- miniPhases.zipWithIndex) {
[error] | ^
[error] |Cannot prove that the value is fully initialized. Only initialized values may be used as arguments.
[error] |
[error] |The unsafe promotion may cause the following problem:
[error] |Cannot prove that the value is fully initialized. May only assign fully initialized value.
[error] 459 | phase.superPhase = this
[error] 460 | phase.idxInGroup = idx
[error] 461 | }
```
This fixes the initialization order to address this error.
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When bootstrapping the compiler with the
-Ysafe-initflag, we wouldget the following error:
This fixes the initialization order to address this error.
Review by @liufengyun