Implement @inline annotation, which helps us implement 'computes' easily

library/annotation/package.scala

library/lang/package.scala

src/main/scala/leon/codegen/CodeGeneration.scala

src/main/scala/leon/frontends/scalac/ASTExtractors.scala

src/main/scala/leon/frontends/scalac/CodeExtraction.scala

src/main/scala/leon/purescala/DefOps.scala

src/main/scala/leon/purescala/Definitions.scala

src/main/scala/leon/purescala/ExprOps.scala

src/main/scala/leon/utils/InliningPhase.scala

src/main/scala/leon/utils/PreprocessingPhase.scala