[llvm] [GISel] Add support for scalable vectors in getGCDType (PR #80307)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff 0d965080b48c5661d7cc5d043be19a6a72165001 c8b5b524aafe7ea87da29baf71734b0d717a992a -- llvm/include/llvm/CodeGen/GlobalISel/Utils.h llvm/lib/CodeGen/GlobalISel/Utils.cpp llvm/unittests/CodeGen/GlobalISel/GISelUtilsTest.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/GlobalISel/Utils.cpp b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
index 0f2def47ec..8fa3e47c74 100644
--- a/llvm/lib/CodeGen/GlobalISel/Utils.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
@@ -1150,23 +1150,23 @@ LLT llvm::getGCDType(LLT OrigTy, LLT TargetTy) {
       llvm_unreachable(
           "getGCDType not implemented between fixed and scalable vectors.");
 
-      unsigned GCD = std::gcd(OrigTy.getElementCount().getKnownMinValue() *
-                                  OrigElt.getSizeInBits().getFixedValue(),
-                              TargetTy.getElementCount().getKnownMinValue() *
-                                  TargetElt.getSizeInBits().getFixedValue());
-      if (GCD == OrigElt.getSizeInBits())
-        return LLT::scalarOrVector(ElementCount::get(1, OrigTy.isScalable()),
-                                   OrigElt);
-
-      // Cannot produce original element type, but both have vscale in common.
-      if (GCD < OrigElt.getSizeInBits())
-        return LLT::scalarOrVector(ElementCount::get(1, OrigTy.isScalable()),
-                                   GCD);
-
-      return LLT::vector(
-          ElementCount::get(GCD / OrigElt.getSizeInBits().getFixedValue(),
-                            OrigTy.isScalable()),
-          OrigElt);
+    unsigned GCD = std::gcd(OrigTy.getElementCount().getKnownMinValue() *
+                                OrigElt.getSizeInBits().getFixedValue(),
+                            TargetTy.getElementCount().getKnownMinValue() *
+                                TargetElt.getSizeInBits().getFixedValue());
+    if (GCD == OrigElt.getSizeInBits())
+      return LLT::scalarOrVector(ElementCount::get(1, OrigTy.isScalable()),
+                                 OrigElt);
+
+    // Cannot produce original element type, but both have vscale in common.
+    if (GCD < OrigElt.getSizeInBits())
+      return LLT::scalarOrVector(ElementCount::get(1, OrigTy.isScalable()),
+                                 GCD);
+
+    return LLT::vector(
+        ElementCount::get(GCD / OrigElt.getSizeInBits().getFixedValue(),
+                          OrigTy.isScalable()),
+        OrigElt);
   }
 
   // If one type is vector and the element size matches the scalar size, then

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https://github.com/llvm/llvm-project/pull/80307