[llvm] [LoongArch] Fold conditional branches with constant conditions (PR #185161)

[via llvm-commits]

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@@ -1239,6 +1239,14 @@ SDValue LoongArchTargetLowering::lowerBRCOND(SDValue Op,
   SDLoc DL(Op);
   MVT GRLenVT = Subtarget.getGRLenVT();
 
+  if (auto *cond = dyn_cast<ConstantSDNode>(CondV)) {
+    if (cond->isZero()) {
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wangleiat wrote:

LLVM coding style prefers [omitting braces when the body consists of a single simple statement](https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements).

https://github.com/llvm/llvm-project/pull/185161