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a967752a95
On X86, the stackprobe emission code chooses the `R11D` register, which is illegal on i686. This ends up wrapping around to `EBX`, which does not get properly callee-saved within the stack probing prologue, clobbering the register for the callers. We fix this by explicitly using `EAX` as the stack probe register. Reviewed By: pengfei Differential Revision: https://reviews.llvm.org/D109203 (cherry picked from commit ae8507b0df738205a6b9e3795ad34672b7499381)
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