Support Qualcomm Kryo 385 CPU variant.

Support Kryo 385 cpu variant which should be used for
Qualcomm Snapdragon 845.

Motivation:
  kryo385 CPU *IS NOT* an Arm Cortex-A75.

Particular problem:
  Cortex-A75 CPU must support optional ARMv8.2 dot product
  feature; kryo385 CPU (Qualcomm Snapdragon 845) doesn't
  support it.

Test: Builds when kryo385 is used as cpu variant.
Test: Pixel 3 boots to GUI with kryo385 as CPU variant
      with this patch on AOSP 9.0.0 r16.

Bug: 119564566

Change-Id: I62ffb46b1977b48446c6c1ca1400b1b39f7a8457

cc/config/arm64_device.go

@@ -68,6 +68,10 @@ var (
 		"kryo": []string{
 			"-mcpu=kryo",
 		},
+		"kryo385": []string{
+			// Use cortex-a53 because kryo385 is not supported in GCC/clang.
+			"-mcpu=cortex-a53",
+		},
 		"exynos-m1": []string{
 			"-mcpu=exynos-m1",
 		},
@@ -92,6 +96,7 @@ func init() {
 		"cortex-a75",
 		"cortex-a76",
 		"kryo",
+		"kryo385",
 		"exynos-m1",
 		"exynos-m2",
 		"denver64")
@@ -144,6 +149,7 @@ var (
 		"cortex-a75": "${config.Arm64ClangCortexA55Cflags}",
 		"cortex-a76": "${config.Arm64ClangCortexA55Cflags}",
 		"kryo":       "${config.Arm64ClangKryoCflags}",
+		"kryo385":    "${config.Arm64ClangCortexA53Cflags}",
 		"exynos-m1":  "${config.Arm64ClangExynosM1Cflags}",
 		"exynos-m2":  "${config.Arm64ClangExynosM2Cflags}",
 	}

cc/config/arm_device.go

@@ -151,6 +151,15 @@ var (
 			// better solution comes around. See Bug 27340895
 			"-D__ARM_FEATURE_LPAE=1",
 		},
+		"kryo385": []string{
+			// Use cortex-a53 because kryo385 is not supported in GCC/clang.
+			"-mcpu=cortex-a53",
+			// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
+			// don't advertise.
+			// TODO This is a hack and we need to add it for each processor that supports LPAE until some
+			// better solution comes around. See Bug 27340895
+			"-D__ARM_FEATURE_LPAE=1",
+		},
 	}
 )
 
@@ -180,6 +189,7 @@ func init() {
 		"cortex-a76",
 		"krait",
 		"kryo",
+		"kryo385",
 		"exynos-m1",
 		"exynos-m2",
 		"denver")
@@ -242,7 +252,7 @@ var (
 		"armv7-a":      "${config.ArmClangArmv7ACflags}",
 		"armv7-a-neon": "${config.ArmClangArmv7ANeonCflags}",
 		"armv8-a":      "${config.ArmClangArmv8ACflags}",
-		"armv8-2a":      "${config.ArmClangArmv82ACflags}",
+		"armv8-2a":     "${config.ArmClangArmv82ACflags}",
 	}
 
 	armClangCpuVariantCflagsVar = map[string]string{
@@ -258,6 +268,7 @@ var (
 		"cortex-a75":     "${config.ArmClangCortexA55Cflags}",
 		"krait":          "${config.ArmClangKraitCflags}",
 		"kryo":           "${config.ArmClangKryoCflags}",
+		"kryo385":        "${config.ArmClangCortexA53Cflags}",
 		"exynos-m1":      "${config.ArmClangCortexA53Cflags}",
 		"exynos-m2":      "${config.ArmClangCortexA53Cflags}",
 		"denver":         "${config.ArmClangCortexA15Cflags}",