Matt Arsenault b94c9e3b55 GlobalISel: Improve MachineIRBuilder construction ...

The current relationship between LegalizerHelper and MachineIRBuilder
confuses me, because the LegalizerHelper modifies the MachineIRBuilder
which it does not own. Constructing a LegalizerHelper destroys the
insert point, since the constructor calls setMF, which clears all the
fields. Try to separate these functions, so it's possible to construct
a LegalizerHelper from an existing MachineIRBuilder without losing the
insert point/debug loc.

2020-06-09 15:05:04 -04:00

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