Quentin Colombet 99e865b618 [TargetRegisterInfo] Add a couple of target hooks for the greedy register allocator ...

Before this patch, the last chance recoloring and deferred spilling
techniques were solely controled by command line options.
This patch adds target hooks for these two techniques so that it
is easier for backend writers to override the default behavior.

The default behavior of the hooks preserves the default values of
the related command line options.

NFC

2020-09-17 15:23:15 -07:00

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