GlobalISel: Fix a failing combiner test

test/CodeGen/AArch64/GlobalISel/combine-trunc.mir was failing
due to the different order for evaluating function arguments.
This patch updates the related code to fix the issue.

diff --git a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
index 7421599..5e2b862 100644 (file)
--- a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
@@ -2113,8 +2113,9 @@ bool CombinerHelper::applyCombineTruncOfShl(
   Register ShiftSrc = MatchInfo.first;
   Register ShiftAmt = MatchInfo.second;
   Builder.setInstrAndDebugLoc(MI);
-  Builder.buildShl(DstReg, Builder.buildTrunc(DstTy, ShiftSrc),
-                   Builder.buildTrunc(DstTy, ShiftAmt), SrcMI->getFlags());
+  auto TruncShiftSrc = Builder.buildTrunc(DstTy, ShiftSrc);
+  auto TruncShiftAmt = Builder.buildTrunc(DstTy, ShiftAmt);
+  Builder.buildShl(DstReg, TruncShiftSrc, TruncShiftAmt, SrcMI->getFlags());
   MI.eraseFromParent();
   return true;
 }