Add C++14 sized delete operators

[kjbracey]

Description

Correct C++14 operation of the alloc wrappers requires us to define
custom sized delete operators.

Their presence won't cause any problem for people compiling as C++03 or
C++11.

Pull request type

[X] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Docs update
[ ] Test update
[ ] Breaking change

[kjbracey]

No test failures seen - it may be that the libraries were actually automatically redirecting from their sized version to our unsized. But suppresses a warning.

[ciarmcom]

@kjbracey-arm, thank you for your changes.
@ARMmbed/mbed-os-core @ARMmbed/mbed-os-maintainers please review.

[pan-]

Thanks @kjbracey-arm for this addition. It is indeed mandatory to define these forms if we define the global version of the delete operator. One thing that can be improved: mark all delete functions as noexcept.

[kjbracey]

I've been assuming noexcept does nothing in our build with exceptions disabled, except be our first C++03 breakage. Do you think it will affect code generation?

[pan-]

I don't think it will impact code generation however the default signatures are noexpect; my remark was just for consistency (see https://isocpp.org/files/papers/n3778.html).

[kjbracey]

I guess I'm just being a bit coy at immediately flinging in non-C++03-compatible code without good reason.

I believe the situation is that we're free to put non-C++03-compatible code in anything targetting 5.14, but this is targetted as a fix for 5.13, so we want it to remain C++03 compatible so people have the option to build as C++03 if they've got an application C++11 incompatibility, for the 5.13 release only.

[0xc0170]

Any review from @ARMmbed/mbed-os-core ?

[0xc0170]

CI started

[mbed-ci]

Test run: FAILED

Summary: 6 of 7 test jobs failed
Build number : 1
Build artifacts

Failed test jobs:

• jenkins-ci/mbed-os-ci_mbed2-build-ARM
• jenkins-ci/mbed-os-ci_build-IAR
• jenkins-ci/mbed-os-ci_mbed2-build-GCC_ARM
• jenkins-ci/mbed-os-ci_build-GCC_ARM
• jenkins-ci/mbed-os-ci_build-ARM
• jenkins-ci/mbed-os-ci_mbed2-build-IAR

[0xc0170]

Test run: FAILED

Jenkins restarted, restarting the job now

[mbed-ci]

Test run: SUCCESS

Summary: 11 of 11 test jobs passed
Build number : 2
Build artifacts