[mono][llvm] Fix alignment of local vars (#106313)

* [mono][llvm] Fix alignment of local vars

klass->min_align specifies the alignment required by the class fields. For example a class/struct containing an int64 will require a minimum alignment of 8 byte for its storage, while a a class/struct containing an int8 will require a 1 byte alignment. `build_named_alloca` is used to allocate storage for a local var of a certain type so using `klass->min_align` is incorrect. We should use `mono_type_size` instead, as this is used throughout the runtime for this purpose. A var of object type should have the alignment `sizeof (gpointer)` since it is a pointer, completely unrelated to the class field layout.

* Re-enable tests

src/libraries/System.Runtime/tests/System.Runtime.Tests/System/LazyTests.cs

@@ -385,7 +385,6 @@ public static void Value_ThrownException_DoesntCreateValue_PublicationOnly()
  Assert.False(lazy.IsValueCreated);
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void EnsureInitialized_SimpleRefTypes()
  {
@@ -417,7 +416,6 @@ public static void EnsureInitialized_SimpleRefTypes()
  Assert.Equal(strTemplate, d);
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void EnsureInitialized_SimpleRefTypes_Invalid()
  {
@@ -430,7 +428,6 @@ public static void EnsureInitialized_SimpleRefTypes_Invalid()
  Assert.Throws<MissingMemberException>(() => LazyInitializer.EnsureInitialized(ref ndc));
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void EnsureInitialized_ComplexRefTypes()
  {
@@ -487,7 +484,6 @@ public static void EnsureInitialized_ComplexRefTypes()
  Assert.Null(LazyInitializer.EnsureInitialized(ref e, ref einit, ref elock, () => { initCount++; return null; }));
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void EnsureInitialized_ComplexRefTypes_Invalid()
  {
@@ -498,7 +494,6 @@ public static void EnsureInitialized_ComplexRefTypes_Invalid()
  Assert.Throws<MissingMemberException>(() => LazyInitializer.EnsureInitialized(ref ndc, ref ndcInit, ref ndcLock));
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void LazyInitializerComplexValueTypes()
  {
@@ -553,7 +548,6 @@ public static void Ctor_Value_ValueType()
  VerifyLazy(lazyObject, 123, hasValue: true, isValueCreated: true);
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void EnsureInitialized_FuncInitializationWithoutTrackingBool_Uninitialized()
  {
@@ -565,7 +559,6 @@ public static void EnsureInitialized_FuncInitializationWithoutTrackingBool_Unini
  Assert.NotNull(syncLock);
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void EnsureInitialized_FuncInitializationWithoutTrackingBool_Initialized()
  {
@@ -577,7 +570,6 @@ public static void EnsureInitialized_FuncInitializationWithoutTrackingBool_Initi
  Assert.Null(syncLock);
  }
 
- [ActiveIssue("https://github.com/dotnet/runtime/issues/105251", TestPlatforms.tvOS)]
  [Fact]
  public static void EnsureInitializer_FuncInitializationWithoutTrackingBool_Null()
  {

src/mono/mono/mini/mini-llvm.c

@@ -2978,10 +2978,10 @@ build_named_alloca (EmitContext *ctx, MonoType *t, char const *name)
 
  g_assert (!mini_is_gsharedvt_variable_type (t));
 
- if (mini_class_is_simd (ctx->cfg, k))
- align = mono_class_value_size (k, NULL);
+ if (mini_class_is_simd (ctx->cfg, k) && !m_type_is_byref (t))
+ align = mono_class_value_size (k, NULL); // FIXME mono_type_size should report correct alignment
  else
- align = mono_class_min_align (k);
+ mono_type_size (t, &align);
 
  /* Sometimes align is not a power of 2 */
  while (mono_is_power_of_two (align) == -1)