TLS alignment lead to a not aligned stack on aarch64

[mohamed-karaoui]

When using TLS, the size of the section may lead to having a not aligned stack on aarch64: the TLS is allocated at the same time as the stack within pthread_create().

This problem is confirmed by the kernel dmesg message: "SP Alignment exception: pc=0000000000508d10 sp=00007ffff6b2a9a8"

A test that show the problem is in the "popcorn-test" repos in the "tls-test" test.

Two possible solutions:

1. Align the TLS section in the LDSCRIPT
2. Modify the musl library to make sure that the stack is aligned

[rlyerly]

@mohamed-karaoui is this issue now closed?

[mohamed-karaoui]

Not sure. I will run the test again on the last master branch, just in case.