[SPIR-V] Remove XFAIL from the passing test (llvm#141489)

This is a follow-up to
llvm#141279 (comment)

Author: vmaksimo

llvm/test/CodeGen/SPIRV/constant/local-arbitrary-width-integers-constants-type-promotion.ll

@@ -1,8 +1,5 @@
 ; RUN: llc -O0 -mtriple=spirv32-unknown-unknown %s -o - | FileCheck %s
 
-; TODO: This test currently fails with LLVM_ENABLE_EXPENSIVE_CHECKS enabled
-; XFAIL: expensive_checks
-
 define i4 @getConstantI4() {
   ret i4 2 ; i4 => OpTypeInt 8
 }