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[docs] Add documentation on using the new pass manager

Authored by aeubanks on Feb 25 2021, 5:21 PM.

Description

[docs] Add documentation on using the new pass manager

And clarify in the "writing a pass" docs that both the legacy and new
PMs are being used for the codegen/optimization pipelines.

Reviewed By: ychen, asbirlea

Differential Revision: https://reviews.llvm.org/D97515

Details

Committed
aeubanksFeb 26 2021, 3:28 PM
Reviewer
ychen
Differential Revision
D97515: [docs] Add documentation on using the new pass manager
Parents
rG81b2c23b7771: AMDGPU: Use kill instruction to hint soft clause live ranges
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