8370579: PPC: fix inswri immediate argument order

[mhaessig]

This cleanup PR swaps and renames the immediate arguments of the two insrwi instruction macros in ppc.ad such that they correspond to the order and names in the manual. This involved swapping the arguments in all six usages. I hope this saves the next person trying to reason about this some confused hours.

Testing:

• Github Actions
• Running some relevant tests (compiler/c2/TestCharShortByteSwap.java, jdk/java/lang/Short/BitTwiddle.java, jdk/java/lang/Integer/BitTwiddle.java, compiler/codegen/Test6431242.java) in qemu

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Progress

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Issue

• JDK-8370579: PPC: fix inswri immediate argument order (Enhancement - P4)

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