Adrian Prantl 57a371d701 Remove overzealous verifier check on DW_OP_LLVM_entry_value and improve the documentation ...

Based on the comments in the code, the idea is that AsmPrinter is
unable to produce entry value blocks of arbitrary length, such as
DW_OP_entry_value [DW_OP_reg5 DW_OP_lit1 DW_OP_plus]. But the way the
Verifier check is written it also disallows DW_OP_entry_value
[DW_OP_reg5] DW_OP_lit1 DW_OP_plus which seems to overshoot the
target.

Note that this patch does not change any of the safety guards in
LiveDebugValues — there is zero behavior change for clang. It just
allows us to legalize more complex expressions in future patches.

rdar://73907559

Differential Revision: https://reviews.llvm.org/D95990

2021-02-04 10:58:35 -08:00

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