35c19de696
Heap_expression::do_get_backend emits an unconditional write
barrier if the type has pointers and it is not a stack allocation.
This CL changes it to use a write barrier for the assignment only
when write barriers are enabled. While here, also change it to
call gcWriteBarrier instead of typedmemmove for pointer-shaped
types.
For this to work, Function::build needs to be adjusted so that
Heap_expression::do_get_backend is called when there is a parent
block.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/181540
From-SVN: r272132
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