[SL.Core] drop meaningless upper limit check

src/SixLabors.Core/Memory/ArrayPoolMemoryAllocator.cs

@@ -118,7 +118,6 @@ namespace SixLabors.Memory
         public override IManagedByteBuffer AllocateManagedByteBuffer(int length, AllocationOptions options = AllocationOptions.None)
         {
             Guard.MustBeGreaterThanOrEqualTo(length, 0, nameof(length));
-            Guard.MustBeLessThan(length, int.MaxValue, nameof(length));
 
             ArrayPool<byte> pool = this.GetArrayPool(length);
             byte[] byteArray = pool.Rent(length);

src/SixLabors.Core/Memory/SimpleGcMemoryAllocator.cs

@@ -16,7 +16,6 @@ namespace SixLabors.Memory
         public override IMemoryOwner<T> Allocate<T>(int length, AllocationOptions options = AllocationOptions.None)
         {
             Guard.MustBeGreaterThanOrEqualTo(length, 0, nameof(length));
-            Guard.MustBeLessThan(length, int.MaxValue, nameof(length));
 
             return new BasicArrayBuffer<T>(new T[length]);
         }
@@ -25,7 +24,6 @@ namespace SixLabors.Memory
         public override IManagedByteBuffer AllocateManagedByteBuffer(int length, AllocationOptions options = AllocationOptions.None)
         {
             Guard.MustBeGreaterThanOrEqualTo(length, 0, nameof(length));
-            Guard.MustBeLessThan(length, int.MaxValue, nameof(length));
 
             return new BasicByteBuffer(new byte[length]);
         }

tests/SixLabors.Core.Tests/Memory/ArrayPoolMemoryAllocatorTests.cs

@@ -249,7 +249,6 @@ namespace SixLabors.Memory.Tests
 
         [Theory]
         [InlineData(-1)]
-        [InlineData(int.MaxValue)]
         public void AllocateManagedByteBuffer_IncorrectAmount_ThrowsCorrect_ArgumentOutOfRangeException(int length)
         {
             var ex = Assert.Throws<ArgumentOutOfRangeException>(() => this.MemoryAllocator.AllocateManagedByteBuffer(length));

tests/SixLabors.Core.Tests/Memory/SimpleGcMemoryAllocatorTests.cs

@@ -21,7 +21,6 @@ namespace SixLabors.Memory.Tests
 
         [Theory]
         [InlineData(-1)]
-        [InlineData(int.MaxValue)]
         public void Allocate_IncorrectAmount_ThrowsCorrect_ArgumentOutOfRangeException(int length)
         {
             var ex = Assert.Throws<ArgumentOutOfRangeException>(() => this.MemoryAllocator.Allocate<BigStruct>( length));
@@ -30,7 +29,6 @@ namespace SixLabors.Memory.Tests
 
         [Theory]
         [InlineData(-1)]
-        [InlineData(int.MaxValue)]
         public void AllocateManagedByteBuffer_IncorrectAmount_ThrowsCorrect_ArgumentOutOfRangeException(int length)
         {
             var ex = Assert.Throws<ArgumentOutOfRangeException>(() => this.MemoryAllocator.AllocateManagedByteBuffer(length));