[llvm] add power function to APInt (PR #122788)

[Craig Topper via llvm-commits]

================
@@ -3108,3 +3108,22 @@ APInt APIntOps::mulhu(const APInt &C1, const APInt &C2) {
   APInt C2Ext = C2.zext(FullWidth);
   return (C1Ext * C2Ext).extractBits(C1.getBitWidth(), C1.getBitWidth());
 }
+
+APInt APIntOps::pow(const APInt &X, int64_t N) {
+  assert(N >= 0 && "negative exponents not supported.");
+  APInt Acc = APInt(X.getBitWidth(), 1);
+  if (N == 0) {
----------------
topperc wrote:

Drop parentheses on single line body

https://github.com/llvm/llvm-project/pull/122788