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anv: fix potential integer overflow

Marcin Ślusarz requested to merge mslusarz/mesa:anv-int-overflow into main

Description by Coverity:

Unintentional integer overflow (OVERFLOW_BEFORE_WIDEN)
overflow_before_widen: Potentially overflowing expression 1 << b with type int
(32 bits, signed) is evaluated using 32-bit arithmetic, and then used in
a context that expects an expression of type VkAccessFlags2KHR (64 bits,
unsigned)

CID: 1492745

CID: 1492748

Fixes: b996fa8e ("anv: implement VK_KHR_synchronization2")

Edited by Marcin Ślusarz

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