unittests: add blake3 test

this provokes RA spilling and hit an assertion fail on main.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

unittests/ASM/FEX_bugs/Blake3.asm

@@ -0,0 +1,56 @@
+%ifdef CONFIG
+{
+}
+%endif
+
+vblendps ymm3, ymm12, ymm9, 0xcc
+vperm2f128 ymm12, ymm1, ymm2, 0x20
+vmovups [rel .data_result + 0], ymm12
+vunpckhps ymm14, ymm4, ymm5
+vblendps ymm4, ymm8, ymm0, 0xcc
+vunpckhps ymm15, ymm6, ymm7
+vperm2f128 ymm7, ymm3, ymm4, 0x20
+vmovups [rel .data_result + 32], ymm7
+vshufps ymm5, ymm10, ymm13, 0x4e
+vblendps ymm6, ymm5, ymm13, 0xcc
+vshufps ymm13, ymm14, ymm15, 0x4e
+vblendps ymm10, ymm10, ymm5, 0xcc
+vblendps ymm14, ymm14, ymm13, 0xcc
+vperm2f128 ymm8, ymm10, ymm14, 0x20
+vmovups [rel .data_result + (32 * 2)], ymm8
+vblendps ymm15, ymm13, ymm15, 0xcc
+vperm2f128 ymm13, ymm6, ymm15, 0x20
+vmovups [rel .data_result + (32 * 3)], ymm13
+vperm2f128 ymm9, ymm1, ymm2, 0x31
+vperm2f128 ymm11, ymm3, ymm4, 0x31
+vmovups [rel .data_result + (32 * 4)], ymm9
+vperm2f128 ymm14, ymm10, ymm14, 0x31
+vperm2f128 ymm15, ymm6, ymm15, 0x31
+vmovups [rel .data_result + (32 * 5)], ymm11
+vmovups [rel .data_result + (32 * 6)], ymm14
+vmovups [rel .data_result + (32 * 7)], ymm15
+vmovdqa ymm0, [rel .data_stack + (32 * 0)]
+vpaddd  ymm1, ymm0, [rel .data_stack + (32 * 1)]
+vmovdqa [rel .data_stack + (32 * 1)], ymm1
+vpxor   ymm0, ymm0, [rel .data]
+vpxor   ymm2, ymm1, [rel .data + 32]
+
+hlt
+
+align 4096
+.data:
+dq 0, 0, 0, 0, 0, 0
+dq 0, 0, 0, 0, 0, 0
+
+.data_stack:
+dq 0, 0, 0, 0
+dq 0, 0, 0, 0
+
+.data_result:
+dq 0, 0, 0, 0
+dq 0, 0, 0, 0
+dq 0, 0, 0, 0
+dq 0, 0, 0, 0
+dq 0, 0, 0, 0
+dq 0, 0, 0, 0
+dq 0, 0, 0, 0