ANDROID: Enable LTO and CFI

Bug: 120439617
Bug: 133186739
Change-Id: I1604ccb18c244610cb95306c1b3874b06dce9995
Signed-off-by: Alistair Strachan <astrachan@google.com>

arch/arm64/configs/cuttlefish_defconfig

@@ -72,6 +72,8 @@ CONFIG_ARM_SCPI_PROTOCOL=y
 # CONFIG_ARM_SCPI_POWER_DOMAIN is not set
 CONFIG_KPROBES=y
 CONFIG_JUMP_LABEL=y
+CONFIG_LTO_CLANG=y
+CONFIG_CFI_CLANG=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODVERSIONS=y

arch/x86/configs/x86_64_cuttlefish_defconfig

@@ -69,6 +69,8 @@ CONFIG_IA32_EMULATION=y
 CONFIG_OPROFILE=y
 CONFIG_KPROBES=y
 CONFIG_JUMP_LABEL=y
+CONFIG_LTO_CLANG=y
+CONFIG_CFI_CLANG=y
 CONFIG_REFCOUNT_FULL=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y

build.config.cuttlefish.aarch64

@@ -1,5 +1,6 @@
 ARCH=arm64
 BRANCH=android-4.19
+CC=clang
 CLANG_TRIPLE=aarch64-linux-gnu-
 CROSS_COMPILE=aarch64-linux-androidkernel-
 DEFCONFIG=cuttlefish_defconfig
@@ -7,6 +8,7 @@ EXTRA_CMDS=''
 KERNEL_DIR=common
 POST_DEFCONFIG_CMDS="check_defconfig"
 CLANG_PREBUILT_BIN=prebuilts-master/clang/host/linux-x86/clang-r353983c/bin
+LD=ld.lld
 LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin
 FILES="
 arch/arm64/boot/Image.gz

build.config.cuttlefish.x86_64

@@ -1,5 +1,6 @@
 ARCH=x86_64
 BRANCH=android-4.19
+CC=clang
 CLANG_TRIPLE=x86_64-linux-gnu-
 CROSS_COMPILE=x86_64-linux-androidkernel-
 DEFCONFIG=x86_64_cuttlefish_defconfig
@@ -7,6 +8,7 @@ EXTRA_CMDS=''
 KERNEL_DIR=common
 POST_DEFCONFIG_CMDS="check_defconfig"
 CLANG_PREBUILT_BIN=prebuilts-master/clang/host/linux-x86/clang-r353983c/bin
+LD=ld.lld
 LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/bin
 FILES="
 arch/x86/boot/bzImage