add bltl (#254)

(cherry picked from commit 583e702547d0347d4634d48a314fc8dd3de75db2)
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011tcyLz63pXjoYEwsFjfg8F

translator/tests/Translator.Tests/PpcLifterAdditionalCoverageTests.cs

@@ -14,6 +14,23 @@ public class PpcLifterAdditionalCoverageTests
     private static PpcInstruction Instruction(uint raw, string mnemonic, params PpcOperand[] operands)
         => PpcInstruction.Synthetic(0x80000000, raw, mnemonic, operands);
 
+    [Fact]
+    public void LinkedConditionalBranchSetsLrBeforeEitherPath()
+    {
+        var branch = PpcDecoder.Decode(0x80004394, 0x41800029);
+        var ir = Assert.Single(new PpcLifter().Lift(new[] { branch })).Ir;
+
+        Assert.Equal("bltl", branch.Mnemonic);
+        var lr = Assert.IsType<IrAssign>(ir[0]);
+        Assert.Equal("lr", lr.Destination);
+        Assert.Equal(unchecked((int)0x80004398u), lr.Value.Constant);
+
+        var decision = Assert.IsType<IrBranch>(ir[1]);
+        Assert.Equal("blt", decision.Condition);
+        Assert.Equal("0x800043BC", decision.TrueLabel);
+        Assert.Equal("0x80004398", decision.FalseLabel);
+    }
+
     [Fact]
     public void LiftsAdditionalNonDotArithmeticAndLogicalForms()
     {