Ensure to re-write only trait method calls of actual trait methods

The inliner would incorrectly treat trait field accessors like
ordinary trait member methods and try to re-write invocations to the
corresponding static method in the implementation class. This rewrite
usually failed because no method was found in the impl class.

However, for lazy val fields, there exists a member in the impl class
with the same name, and the rewrite was performed. The result was that
every field access would execute the lazy initializer instead of
reading the field.

This commit checks the traitMethodWithStaticImplementation field of
the ScalaInlineInfo classfile attribute and puts an explicit
`safeToRewrite` flag to each call site in the call graph. This cleans
up the code in the inliner that deals with rewriting trait callsites.

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