[llvm] [RISCV64] liveness analysis (PR #167454)

[Matt Arsenault via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -mtriple=riscv64 -riscv-enable-live-variables -verify-machineinstrs -o - %s | FileCheck %s
+#
+# Test basic live variable analysis with simple control flow and basic blocks
+
+# REQUIRES: Assertions
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arsenm wrote:

```suggestion
# REQUIRES: asserts
```

https://github.com/llvm/llvm-project/pull/167454