Extends PSHUFB unit tests to ensure correct behaviour

Explicitly testign bits being set in the reserved bits

unittests/ASM/H0F38/66_00_2.asm

@@ -0,0 +1,36 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "XMM0": ["0x5858585858585858", "0x5858585858585858"],
+    "XMM1": ["0x0", "0x0"]
+  }
+}
+%endif
+
+mov rdx, 0xe0000000
+
+mov rax, 0x4142434445464748
+mov [rdx + 8 * 0], rax
+mov rax, 0x5152535455565758
+mov [rdx + 8 * 1], rax
+
+movaps xmm0, [rdx + 8 * 0]
+movaps xmm1, [rdx + 8 * 0]
+
+lea rdx, [rel .data]
+
+pshufb xmm0, [rdx + 8 * 0]
+pshufb xmm1, [rdx + 8 * 2]
+
+hlt
+
+align 8
+.data:
+; Test bits with trash data in reserved bits to ensure it is ignored
+; Select single element
+dq 0x7878787878787878
+dq 0x7878787878787878
+; Clear element
+dq 0xF0F0F0F0F0F0F0F0
+dq 0xF0F0F0F0F0F0F0F0
+

unittests/ASM/H0F38/XX_00_2.asm

@@ -0,0 +1,28 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "MM0": "0x4444444444444444",
+    "MM1": "0x0"
+  }
+}
+%endif
+
+lea rdx, [rel .data]
+
+movq mm0, [rdx + 8 * 0]
+movq mm1, [rdx + 8 * 0]
+
+pshufb mm0, [rdx + 8 * 1]
+pshufb mm1, [rdx + 8 * 2]
+
+hlt
+
+align 8
+.data:
+; Incoming vector
+dq 0x4142434445464748
+; Test bits with trash data in reserved bits to ensure it is ignored
+; Select single element
+dq 0x7C7C7C7C7C7C7C7C
+; Clear element
+dq 0xF8F8F8F8F8F8F8F8