Fix EPILOGUE_USES regression in CoreMark

Registered by Michael Hope

CoreMark regresses in Thumb-2 mode when using the LR regnum. Otherwise it's a good improvement. Investigate and fix. The idea is to use LR register as a general purpose register fit for use in a number of cases. The change proposed was the one upstream http://<email address hidden>/msg05706.html and that causes a regression in coremark.

Blueprint information

Status:
Complete
Approver:
Michael Hope
Priority:
Medium
Drafter:
Ramana Radhakrishnan
Direction:
Approved
Assignee:
Kugan Vivekanandarajah
Definition:
Approved
Series goal:
Accepted for 4.6
Implementation:
Informational Informational
Milestone target:
milestone icon backlog
Started by
Kugan Vivekanandarajah
Completed by
Matthew Gretton-Dann

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