Revert "[HLSL] update StructuredBuffer subscript test for alwaysinline (#109023)"

This reverts commit f4fe26d.

Reason: 4a63f4d reverted "[HLSL] set alwaysinline on HLSL functions (#106588)" due to a buildbot failure; this test (which builds upon the reverted patch) also needs to be reverted.

Author: thurstond

clang/test/CodeGenHLSL/builtins/StructuredBuffer-subscript.hlsl

@@ -11,7 +11,6 @@ void main(unsigned GI : SV_GroupIndex) {
 // Even at -O0 the subscript operators get inlined. The -O0 IR is a bit messy
 // and confusing to follow so the match here is pretty weak.
 
-// CHECK: define void @main()
-// Verify inlining leaves only calls to "llvm." intrinsics
-// CHECK-NOT:   call {{[^@]*}} @{{[^l][^l][^v][^m][^\.]}}
+// CHECK: define internal void @"?main@@YAXI@Z"
+// CHECK-NOT: call
 // CHECK: ret void