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[BPF] add support for 32 bit registers in inline asm

Authored by alessandrod on May 16 2021, 9:32 AM.

Description

[BPF] add support for 32 bit registers in inline asm

Add "w" constraint type which allows selecting 32 bit registers.
32 bit registers were added in https://reviews.llvm.org/rGca31c3bb3ff149850b664838fbbc7d40ce571879.

Differential Revision: https://reviews.llvm.org/D102118