Add Clang 3.4 host prebuilts to AOSP manifest.

Change-Id: Ibb8d91096a7a58e40700890c50ab49e03d9ee0d5

default.xml

@@ -371,12 +371,14 @@
   <project path="prebuilts/clang/darwin-x86/3.2" name="platform/prebuilts/clang/darwin-x86/3.2" groups="pdk,darwin" />
   <project path="prebuilts/clang/darwin-x86/arm/3.3" name="platform/prebuilts/clang/darwin-x86/arm/3.3" groups="darwin,arm" />
   <project path="prebuilts/clang/darwin-x86/host/3.3" name="platform/prebuilts/clang/darwin-x86/host/3.3" groups="darwin" />
+  <project path="prebuilts/clang/darwin-x86/host/3.4" name="platform/prebuilts/clang/darwin-x86/host/3.4" groups="pdk,darwin" />
   <project path="prebuilts/clang/darwin-x86/mips/3.3" name="platform/prebuilts/clang/darwin-x86/mips/3.3" groups="darwin,mips" />
   <project path="prebuilts/clang/darwin-x86/x86/3.3" name="platform/prebuilts/clang/darwin-x86/x86/3.3" groups="darwin,x86" />
   <project path="prebuilts/clang/linux-x86/3.1" name="platform/prebuilts/clang/linux-x86/3.1" groups="pdk,linux" />
   <project path="prebuilts/clang/linux-x86/3.2" name="platform/prebuilts/clang/linux-x86/3.2" groups="pdk,linux" />
   <project path="prebuilts/clang/linux-x86/arm/3.3" name="platform/prebuilts/clang/linux-x86/arm/3.3" groups="linux,arm" />
   <project path="prebuilts/clang/linux-x86/host/3.3" name="platform/prebuilts/clang/linux-x86/host/3.3" groups="linux" />
+  <project path="prebuilts/clang/linux-x86/host/3.4" name="platform/prebuilts/clang/linux-x86/host/3.4" groups="pdk,linux" />
   <project path="prebuilts/clang/linux-x86/mips/3.3" name="platform/prebuilts/clang/linux-x86/mips/3.3" groups="linux,mips" />
   <project path="prebuilts/clang/linux-x86/x86/3.3" name="platform/prebuilts/clang/linux-x86/x86/3.3" groups="linux,x86" />
   <project path="prebuilts/devtools" name="platform/prebuilts/devtools" />