Switch to clang-2577113.

Bug: http://b/25282907

This is actually based on clang/LLVM upstream revision r256229.

Change-Id: I335be68f196e5b55ac2816fa854e97b841b54240
diff --git a/core/clang/config.mk b/core/clang/config.mk
index c184a87..b215c6f 100644
--- a/core/clang/config.mk
+++ b/core/clang/config.mk
@@ -1,9 +1,10 @@
 ## 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)