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Revert commit 0e46b49de433 from llvm-project (by Matt Arsenault):
authorDimitry Andric <dim@FreeBSD.org>
Tue, 2 Jan 2024 16:07:31 +0000 (17:07 +0100)
committerDimitry Andric <dim@FreeBSD.org>
Sat, 6 Apr 2024 20:13:11 +0000 (22:13 +0200)
commitedc2dc17b1f2dfe45dc85e6cc0ff54bca1ac8214
tree77120e80d48417945a04975107dfc5ebe05f6d58
parentcb14a3fe5122c879eae1fb480ed7ce82a699ddb6
Revert commit 0e46b49de433 from llvm-project (by Matt Arsenault):

  Reapply "RegisterCoalescer: Add implicit-def of super register when coalescing SUBREG_TO_REG"

  This reverts commit c398fa009a47eb24f88383d5e911e59e70f8db86.

  PPC backend was fixed in 2f82662ce901c6666fceb9c6c5e0de216a1c9667

Since it causes an assertion failure building /sys/dev/fb/vga.c:
https://github.com/llvm/llvm-project/issues/76416

PR: 276104
MFC after: 1 month
contrib/llvm-project/llvm/lib/CodeGen/RegisterCoalescer.cpp