[clang] [CIR] Add bit reverse and byte reverse operations (PR #147200)

[Henrich Lauko via cfe-commits]

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@@ -190,6 +190,26 @@ RValue CIRGenFunction::emitBuiltinExpr(const GlobalDecl &gd, unsigned builtinID,
                                                 expectedValue, probAttr);
     return RValue::get(result);
   }
+
+  case Builtin::BI__builtin_bswap16:
+  case Builtin::BI__builtin_bswap32:
+  case Builtin::BI__builtin_bswap64:
+  case Builtin::BI_byteswap_ushort:
+  case Builtin::BI_byteswap_ulong:
+  case Builtin::BI_byteswap_uint64: {
+    mlir::Value arg = emitScalarExpr(e->getArg(0));
+    return RValue::get(
+        builder.create<cir::ByteSwapOp>(getLoc(e->getSourceRange()), arg));
----------------
xlauko wrote:

Lets pull out `mlir::Location loc = getLoc(e->getSourceRange())` to the beginning of the function and use it throughout the function. This will reduce a lot of unnecessary indent.

https://github.com/llvm/llvm-project/pull/147200