Merge "Switch to clang-2577113."

## Clang configurations.

LLVM_PREBUILTS_VERSION ?= 3.8

LLVM_RELEASE_VERSION := 3.8

LLVM_PREBUILTS_VERSION ?= clang-2577113

LLVM_PREBUILTS_BASE ?= prebuilts/clang/host

LLVM_PREBUILTS_PATH := $(LLVM_PREBUILTS_BASE)/$(BUILD_OS)-x86/$(LLVM_PREBUILTS_VERSION)/bin

LLVM_RTLIB_PATH := $(LLVM_PREBUILTS_PATH)/../lib/clang/$(LLVM_PREBUILTS_VERSION)/lib/linux/

LLVM_RTLIB_PATH := $(LLVM_PREBUILTS_PATH)/../lib/clang/$(LLVM_RELEASE_VERSION)/lib/linux/

CLANG := $(LLVM_PREBUILTS_PATH)/clang$(BUILD_EXECUTABLE_SUFFIX)

CLANG_CXX := $(LLVM_PREBUILTS_PATH)/clang++$(BUILD_EXECUTABLE_SUFFIX)