[llvm] [Support][APint] Optimize fallback case in APInt::reverseBits (PR #189291)

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``````````diff
diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index b5e1a3276..df82d4da1 100644
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -785,7 +785,7 @@ APInt APInt::reverseBits() const {
     return APInt(BitWidth, llvm::reverseBits<uint16_t>(U.VAL));
   case 8:
     return APInt(BitWidth, llvm::reverseBits<uint8_t>(U.VAL));
-  case 1:  // fallthrough
+  case 1: // fallthrough
   case 0:
     return *this;
   default:
@@ -793,7 +793,8 @@ APInt APInt::reverseBits() const {
   }
   // Special case for all widths less than 64 and non-power-of-2
   if (BitWidth < 64)
-      return APInt(BitWidth, llvm::reverseBits<uint64_t>(U.VAL) >> (64 - BitWidth));
+    return APInt(BitWidth,
+                 llvm::reverseBits<uint64_t>(U.VAL) >> (64 - BitWidth));
 
   APInt Result(BitWidth, 0);
   unsigned NumWords = getNumWords();

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https://github.com/llvm/llvm-project/pull/189291