host/i386: nothing looks at CPUINFO_SSE4

The only user was the SSE4.1 variant of buffer_is_zero, which has
been removed; code to compute CPUINFO_SSE4 is dead.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

host/include/i386/host/cpuinfo.h

@@ -16,7 +16,6 @@
 #define CPUINFO_BMI1            (1u << 5)
 #define CPUINFO_BMI2            (1u << 6)
 #define CPUINFO_SSE2            (1u << 7)
-#define CPUINFO_SSE4            (1u << 8)
 #define CPUINFO_AVX1            (1u << 9)
 #define CPUINFO_AVX2            (1u << 10)
 #define CPUINFO_AVX512F         (1u << 11)

util/cpuinfo-i386.c

@@ -36,7 +36,6 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
 
         info |= (d & bit_CMOV ? CPUINFO_CMOV : 0);
         info |= (d & bit_SSE2 ? CPUINFO_SSE2 : 0);
-        info |= (c & bit_SSE4_1 ? CPUINFO_SSE4 : 0);
         info |= (c & bit_MOVBE ? CPUINFO_MOVBE : 0);
         info |= (c & bit_POPCNT ? CPUINFO_POPCNT : 0);
         info |= (c & bit_PCLMUL ? CPUINFO_PCLMUL : 0);