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[AArch64][SVE] Emit DWARF location expr for SVE (dbg.declare)

Authored by sdesmalen on Jan 6 2021, 3:38 AM.

Description

[AArch64][SVE] Emit DWARF location expr for SVE (dbg.declare)

When using dbg.declare, the debug-info is generated from a list of
locals rather than through DBG_VALUE instructions in the MIR.
This patch is different from D90020 because it emits the DWARF
location expressions from that list of locals directly.

Reviewed By: jmorse

Differential Revision: https://reviews.llvm.org/D90044

Details