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[PowerPC][NFC] Added `getDefMIPostRA` method

Description

[PowerPC][NFC] Added getDefMIPostRA method

Summary:
In PostRA phase, we often have to find out the most recent definition
of a register. This patch adds getDefMIPostRA so that other methods
can use it rather than implementing it repeatedly.

Differential Revision: https://reviews.llvm.org/D65131