Build dalvikvm with Clang.
Revert "Build dalvikvm with Clang."

This reverts commit fd770a6760ef25faebadfc9a0a4a61dea27312fc.
Fix build with LTO
Revert "Fix build with LTO"

This reverts commit 3de09fda493d122f07a6fd733923bafa38f5f4ff.