Denis Antrushin 2a52c3301a [Statepoints] Properly handle const base pointer. ...

Current code in InstEmitter assumes all GC pointers are either
VRegs or stack slots - hence, taking only one operand.
But it is possible to have constant base, in which case it
occupies two machine operands.

Add a convinience function to StackMaps to get index of next
meta argument and use it in InsrEmitter to properly advance to
the next statepoint meta operand.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D87252

2020-09-09 14:07:00 +07:00

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