[tests] Enable several test cases on non-Darwin platforms

[rintaro]

What's in this pull request?

Enable several test cases on non-Darwin platforms.

• test/1_stdlib/ManagedBuffer.swift
• test/1_stdlib/Mirror.swift
• test/Interpreter/SDK/libc.swift
• validation-test/stdlib/ArrayNew.swift.gyb
• validation-test/stdlib/Dictionary.swift
• validation-test/stdlib/Unicode.swift

---

Before merging this pull request to apple/swift repository:

• Test pull request on Swift continuous integration.

[gribozavr]

@swift-ci Please test and merge

[gribozavr]

@rintaro Thank you!

[gribozavr]

@rintaro Seems like Linux tests failed, could you take a look?

[rintaro]

I'm looking into it.

https://ci.swift.org/job/swift-PR-Linux/1551/console

[ RUN      ] ManagedBuffer.basic
stdout>>> check failed at /home/buildnode/jenkins/workspace/swift-PR-Linux@2/swift/test/1_stdlib/ManagedBuffer.swift, line 149
stdout>>> 12 >= 13
[     FAIL ] ManagedBuffer.basic

tests.test("basic") {                                                             
  do {                                                                            
    let s = TestManagedBuffer<LifetimeTracked>.create(0)                          
    expectEqual(1, LifetimeTracked.instances)                                     
  }                                                                               

  expectEqual(0, LifetimeTracked.instances)                                       
  do {                                                                            
    let s = TestManagedBuffer<LifetimeTracked>.create(10)                         
    expectEqual(0, s.count)                                                       
    expectLE(10, s.myCapacity)                                                    
    expectGE(12, s.myCapacity)  // allow some over-allocation but not too much 
    // ^ Failing test

[gribozavr]

If we need to relax the bounds by a little bit, feel free to do so.

[gparker42]

That capacity test is dependent on the malloc implementation. It is likely that 13 is the expected result on that Linux version.

[rintaro]

@gparker42
The problem is, I'm not sure what should be the acceptable max capacity 😅

[gribozavr]

@rintaro Bump it to what's needed on your system, and we can bump it further if it is needed for other systems. We just don't want to set it too high, since what's the point in checking at all then.

[rintaro]

@gribozavr OK, updated to 13 for now :)

[gribozavr]

@swift-ci Please test and merge