Yonghong Song 44b16bd4a5 [Transforms] Do not drop !preserve.access.index metadata ...

Currently, when a GVN or CSE optimization happens,
the llvm.preserve.access.index metadata is dropped.
This caused a problem for BPF AbstructMemberOffset phase
as it relies on the metadata (debuginfo types).

This patch added proper hooks in lib/Transforms to
preserve !preserve.access.index metadata. A test
case is added to ensure metadata is preserved under CSE.

Differential Revision: https://reviews.llvm.org/D65700

llvm-svn: 367769

2019-08-03 23:41:26 +00:00

231 KiB

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