fix tests using "S0"

Author: s-barannikov

llvm/test/CodeGen/PowerPC/pr15359.ll

@@ -1,7 +1,7 @@
 ; RUN: llc -verify-machineinstrs -O0 -mcpu=pwr7 -filetype=obj %s -o - | \
 ; RUN: llvm-readobj --symbols - | FileCheck %s
 
-target datalayout = "E-p:64:64:64-S0-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:128:128-v64:64:64-v128:128:128-a0:0:64-n32:64"
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:128:128-v64:64:64-v128:128:128-a0:0:64-n32:64"
 target triple = "powerpc64-unknown-linux-gnu"
 
 @nextIdx = external thread_local global i32

llvm/test/CodeGen/PowerPC/pr16556-2.ll

@@ -3,7 +3,7 @@
 ; This test formerly failed because of wrong custom lowering for
 ; fptosi of ppc_fp128.
 
-target datalayout = "E-p:32:32:32-S0-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:64:128-v64:64:64-v128:128:128-a0:0:64-n32"
+target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:64:128-v64:64:64-v128:128:128-a0:0:64-n32"
 target triple = "powerpc-unknown-linux-gnu"
 
 %core.time.TickDuration = type { i64 }

llvm/test/CodeGen/PowerPC/pr16556.ll

@@ -2,7 +2,7 @@
 
 ; This test formerly failed due to no handling for a ppc_fp128 undef.
 
-target datalayout = "E-p:32:32:32-S0-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:64:128-v64:64:64-v128:128:128-a0:0:64-n32"
+target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:64:128-v64:64:64-v128:128:128-a0:0:64-n32"
 target triple = "powerpc-unknown-linux-gnu"
 
 %core.time.TickDuration.37.125 = type { i64 }

mlir/lib/Target/LLVMIR/DataLayoutImporter.cpp

@@ -197,9 +197,9 @@ DataLayoutImporter::tryToEmplaceStackAlignmentEntry(StringRef token) {
   if (failed(alignment))
     return failure();
 
-  // Only store the stack alignment if it has a non-default value.
+  // Stack alignment shouldn't be zero.
   if (*alignment == 0)
-    return success();
+    return failure();
   OpBuilder builder(context);
   keyEntries.try_emplace(key, DataLayoutEntryAttr::get(
                                   key, builder.getI64IntegerAttr(*alignment)));

mlir/test/Target/LLVMIR/Import/data-layout.ll

@@ -47,5 +47,4 @@ target datalayout = "A1-E-p270:16:32:64:8-p271:16:32:64-i64:64:128"
 ; CHECK: dlti.dl_spec =
 ; CHECK: #dlti.dl_spec<
 ; CHECK-NOT:   #dlti.dl_entry<"dlti.alloca_memory_space"
-; CHECK-NOT:   #dlti.dl_entry<"dlti.stack_alignment"
-target datalayout = "A0-S0"
+target datalayout = "A0"