Summary: Fixes incorrect handling of precompiled headers in diff mode.
Reviewed-by: never, twisti

Reviewed-by: rasbold, jrose, twisti

Summary: Add 2 news classes to create VC8 and VC9 projects
Reviewed-by: apetrusenko, xlu

Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

Summary: Define HOTSPOT_LIB_ARCH in the preprocessor flags of the generated projects
Reviewed-by: kamg, xlu

Reviewed-by: kvn