[X86] add dwarf information for loop stack probe

This patch is based on https://reviews.llvm.org/D99585

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While inside the stack probing loop, temporarily change the CFA
to be based on r11/eax, which are already used to hold the loop bound.
The stack pointer cannot be used for CFI here as it changes during the loop,
so it does not have a constant offset to the CFA.

Co-authored-by: YangKeao <keao.yang@yahoo.com>

Reviewed By: nagisa

Differential Revision: https://reviews.llvm.org/D116628