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[stack-clash] Fix probing of dynamic alloca

Authored by serge-sans-paille on Oct 27 2020, 2:59 AM.

Description

[stack-clash] Fix probing of dynamic alloca

  • The first touch on a dynamic alloca cannot use a mov because it clobbers existing space. Use a xor 0 instead

Differential Revision: https://reviews.llvm.org/D90216