Superfluous dialect symbol in inline assembly

[fuhsnn]

Bug report

Bug description:

This inline assembly block has an extra { at the start that is likely a typo:

cpython/Include/internal/pycore_pystate.h

Line 327 in f715d25

__asm__("{movq %%rsp, %0" : "=r" (result));

In GCC style inline assembly syntax, { initiates an dialect selector block [1] and this case forms an unfinished section of that.
It being silently accepted by current GCC/Clang is likely just them being permissive.

[1] https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Multiple-assembler-dialects-in-asm-templates

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-157250: Remove superfluous symbol in inline assembly #157251