v1.5.2
[build][asm] Pass ASFLAGS to the assembler instead of CFLAGS
fix gitignore
[linux-kernel] Don't inline function in zstd_opt.c
[linux-kernel] Update README with initial instructions on how to update zstd in the kernel
Add BtrFS benchmarks
[linux] Write all the patch summaries
[asm] Share portability macros and restrict ASM further
[linux-kernel] Don't add -O3 to CFLAGS
[contrib][linux] Fix up SPDX license identifiers
Add typedefs for 8bit (un)signed
[kernel] Update README with SquashFS patch
[contrib][linux] Reduce stack usage by 80 bytes