[msan][test] Add another target("aarch64.svcount") test case (#164343)

This shows a crash that happens because MSan tries to check the shadow
of a target("aarch64.svcount")-sized argument.

This is the followup to
#164315. This also does a
drive-by fix of those test cases, to remove FileCheck (otherwise, even
if opt passed, the test would still XFAIL because FileCheck cannot find
any CHECK: assertions).

Forked from llvm/test/CodeGen/AArch64/sme2-intrinsics-add.ll

Author: thurstond

llvm/test/Instrumentation/MemorySanitizer/AArch64/sme-aarch64-svcount-mini.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -S -passes=msan -mattr=+sme -o - %s | FileCheck %s
+; RUN: opt -S -passes=msan -mattr=+sme -o - %s
 
 ; XFAIL: *
 

llvm/test/Instrumentation/MemorySanitizer/AArch64/sme-aarch64-svcount.ll

@@ -1,5 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -S -passes=msan -mattr=+sme -o - %s | FileCheck %s
+; RUN: opt -S -passes=msan -mattr=+sme -o - %s
 
 ; XFAIL: *
 

llvm/test/Instrumentation/MemorySanitizer/AArch64/sme2-intrinsics-add-mini.ll

@@ -0,0 +1,16 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -passes=msan -mattr=+sme2 -mattr=+sme-i16i64 -mattr=+sme-f64f64 -o - %s
+
+; XFAIL: *
+
+; Forked from llvm/test/CodeGen/AArch64/sme2-intrinsics-add.ll
+; Manually reduced to show MSan leads to a compiler crash
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64--linux-android9001"
+
+define void @multi_vector_add_za_vg1x4_f32_tuple(i64 %stride, ptr %ptr) sanitize_memory {
+  %1 = tail call target("aarch64.svcount") @llvm.aarch64.sve.ptrue.c8()
+  %2 = tail call { <vscale x 4 x float>, <vscale x 4 x float>, <vscale x 4 x float>, <vscale x 4 x float> } @llvm.aarch64.sve.ld1.pn.x4.nxv4f32(target("aarch64.svcount") %1, ptr %ptr)
+  ret void
+}