configs: GPUFS: Turn off SSE4 and fancy XSAVEs (#1041)

A user reported a bug with the SSE4.1 version of memcmp in libc. When
enabled the simulated program crashes with SIGILL. After attempting all
fixes recommended by Intel SDM and still not working, turning the bit
off instead.

Similar, the default XSAVE functionality is not completely implemented
for AVX and newer ISA extensions. Therefore, there is not much point to
claiming to support the more advanced versions of XSAVE (XSAVEOPT,
XSAVEC, XSAVES, and XGETBV with ECX=1).

Note that none of these bits are enabled for non-GPU full system
simulations (see src/arch/x86/X86ISA.py). This only impacts GPUFS
simulations.

Change-Id: I8eb7bf0f2a0a29226095e7889fec9c1e8a65f88f

configs/example/gpufs/system/system.py

@@ -263,7 +263,7 @@ def makeGpuFSSystem(args):
         0x00000340,
         0x00000000,
         0x00000340,
-        0x0000000F,
+        0x00000000,
         0x00000340,
         0x00000000,
         0x00000000,
@@ -281,7 +281,7 @@ def makeGpuFSSystem(args):
     # See: https://sandpile.org/x86/cpuid.htm#level_0000_0001h
     # Enables AVX, OSXSAVE, XSAVE, POPCNT, SSE4.2, SSE4.1, CMPXCHG16B,
     # and FMA.
-    avx_cpu_features = [0x00020F51, 0x00000805, 0xEFDBFBFF, 0x1C983209]
+    avx_cpu_features = [0x00020F51, 0x00000805, 0xEFDBFBFF, 0x1C803209]
 
     for i, cpu in enumerate(system.cpu):
         # Break once we reach the shader "CPU"