[llvm] [X86][GlobalISel] Reorganize br/brcond tests (NFC) (PR #80204)

[Evgenii Kudriashov via llvm-commits]

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@@ -0,0 +1,1508 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s                               -mtriple=x86_64-apple-darwin10 -verify-machineinstrs | FileCheck %s --check-prefixes=SDAG-X64
+; RUN: llc < %s -fast-isel -fast-isel-abort=1 -mtriple=x86_64-apple-darwin10 -verify-machineinstrs | FileCheck %s --check-prefixes=FASTISEL-X64
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e-kud wrote:

Yes, the tests with a single argument are the same between X86/X64. I've recently thought that in many cases FastISel and SelectionDAG produce the same output, maybe we can try to unify them under something like `DAG-X86`, `DAG-X64` as they DAG compatible. Or another prefix to put them into the same basket if any.

https://github.com/llvm/llvm-project/pull/80204