[llvm] [SandboxIR] Add remaining SelectInst methods and track swapValues() (PR #108114)

[via llvm-commits]

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@@ -1371,6 +1375,13 @@ define void @foo(i1 %c0, i8 %v0, i8 %v1, i1 %c1) {
   // Check setFalseValue().
   Select->setFalseValue(V0);
   EXPECT_EQ(Select->getFalseValue(), V0);
+  // Check swapValues().
+  Select->swapValues();
+  EXPECT_EQ(Select->getTrueValue(), V0);
+  EXPECT_EQ(Select->getFalseValue(), V1);
+  // Check areInvalidOperands.
+  EXPECT_EQ(sandboxir::SelectInst::areInvalidOperands(Cond, V0, V1), nullptr);
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vporpo wrote:

Hmm shouldn't this be EXPECT_NE ? and the one below EXPECT_EQ ? Btw. I think the bots are failing because `Cond` should be `Cond0`.

https://github.com/llvm/llvm-project/pull/108114