internal/cpu: make arm64 capability bits naming less verbose

This makes the constant names less verbose and aligns them more
with the Linux kernel which uses HWCAP_XXX for the constant names.

Change-Id: Ia7d079b59b57978adc045945951eaa1d99b41fac
Reviewed-on: https://go-review.googlesource.com/91738
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/internal/cpu/cpu_arm64.go

@@ -16,28 +16,28 @@ var arm64_hwcap2 uint
 
 // HWCAP/HWCAP2 bits. These are exposed by Linux.
 const (
-	_ARM64_FEATURE_HAS_FP      = (1 << 0)
-	_ARM64_FEATURE_HAS_ASIMD   = (1 << 1)
-	_ARM64_FEATURE_HAS_EVTSTRM = (1 << 2)
-	_ARM64_FEATURE_HAS_AES     = (1 << 3)
-	_ARM64_FEATURE_HAS_PMULL   = (1 << 4)
-	_ARM64_FEATURE_HAS_SHA1    = (1 << 5)
-	_ARM64_FEATURE_HAS_SHA2    = (1 << 6)
-	_ARM64_FEATURE_HAS_CRC32   = (1 << 7)
-	_ARM64_FEATURE_HAS_ATOMICS = (1 << 8)
+	hwcap_FP      = (1 << 0)
+	hwcap_ASIMD   = (1 << 1)
+	hwcap_EVTSTRM = (1 << 2)
+	hwcap_AES     = (1 << 3)
+	hwcap_PMULL   = (1 << 4)
+	hwcap_SHA1    = (1 << 5)
+	hwcap_SHA2    = (1 << 6)
+	hwcap_CRC32   = (1 << 7)
+	hwcap_ATOMICS = (1 << 8)
 )
 
 func init() {
 	// HWCAP feature bits
-	ARM64.HasFP = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_FP)
-	ARM64.HasASIMD = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_ASIMD)
-	ARM64.HasEVTSTRM = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_EVTSTRM)
-	ARM64.HasAES = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_AES)
-	ARM64.HasPMULL = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_PMULL)
-	ARM64.HasSHA1 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_SHA1)
-	ARM64.HasSHA2 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_SHA2)
-	ARM64.HasCRC32 = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_CRC32)
-	ARM64.HasATOMICS = isSet(arm64_hwcap, _ARM64_FEATURE_HAS_ATOMICS)
+	ARM64.HasFP = isSet(arm64_hwcap, hwcap_FP)
+	ARM64.HasASIMD = isSet(arm64_hwcap, hwcap_ASIMD)
+	ARM64.HasEVTSTRM = isSet(arm64_hwcap, hwcap_EVTSTRM)
+	ARM64.HasAES = isSet(arm64_hwcap, hwcap_AES)
+	ARM64.HasPMULL = isSet(arm64_hwcap, hwcap_PMULL)
+	ARM64.HasSHA1 = isSet(arm64_hwcap, hwcap_SHA1)
+	ARM64.HasSHA2 = isSet(arm64_hwcap, hwcap_SHA2)
+	ARM64.HasCRC32 = isSet(arm64_hwcap, hwcap_CRC32)
+	ARM64.HasATOMICS = isSet(arm64_hwcap, hwcap_ATOMICS)
 }
 
 func isSet(hwc uint, value uint) bool {