[llvm] [AMDGPU] Check for a live interval before querying register kind in getLiveRegs (PR #209328)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/GCNRegPressure.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/GCNRegPressure.cpp b/llvm/lib/Target/AMDGPU/GCNRegPressure.cpp
index 4680314ca..dcc61eee2 100644
--- a/llvm/lib/Target/AMDGPU/GCNRegPressure.cpp
+++ b/llvm/lib/Target/AMDGPU/GCNRegPressure.cpp
@@ -512,7 +512,8 @@ GCNRPTracker::LiveRegSet llvm::getLiveRegs(SlotIndex SI,
     // Check for a live interval before querying the register kind: getRegKind
     // reads the register class, which is unset for classless vregs (e.g. unused
     // GlobalISel InstructionSelect leftovers). Such vregs have no interval, so
-    // testing hasInterval first skips them without touching their (absent) class.
+    // testing hasInterval first skips them without touching their (absent)
+    // class.
     if (!LIS.hasInterval(Reg))
       continue;
     if (RegKind != GCNRegPressure::TOTAL_KINDS &&

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https://github.com/llvm/llvm-project/pull/209328