ignore new readnone attribute in llvm 3.4
disable vectorization which llvm 3.4 has on by default
ignore new readonly attribute in llvm 3.4
refactor vector disabling code
apply EMMAKEN_CFLAGS directly to commandline, not just to clang calls, so that we can parse it in emcc and e.g. disable vectorization as necessary
fix poppler configure for clang 3.4
check clang version before applying version-specific changes, like disabling vectorization in llvm 3.4
option to benchmark multiple llvm versions, both native and js
refactor lua benchmark
benchmark updates
Merge branch 'incoming' into llvm-3.4

Conflicts:
	tests/test_benchmark.py
	tools/shared.py