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Add a new -fglobal-isel option and make -fexperimental-isel an alias for it.

Authored by aemerson on Mar 30 2020, 3:31 PM.

Description

Add a new -fglobal-isel option and make -fexperimental-isel an alias for it.

Since GlobalISel is maturing and is already on at -O0 for AArch64, it's not
completely "experimental". Create a more appropriate driver flag and make
the older option an alias for it.

Differential Revision: https://reviews.llvm.org/D77103

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