Improve `ModuleConfig` initialization.

There are three `ModuleConfigs`, one for each `ModuleKind`. The code to
initialized them is spaghetti imperative code that sets each field to a
default value and then modifies many fields in complicated ways. This
makes it very hard to tell what value ends up in each field in each
config.

For example, the `modules_config.emit_pre_lto_bc` field is set twice,
which means it can be set to true and then incorrectly set back to
false. (This probably hasn't been noticed because it happens in a very
obscure case.)

This commit changes the code to a declarative style in which
`ModuleConfig::new` initializes all fields and then they are never
changed again. This is slightly more concise and much easier to read.
(And it fixes the abovementioned `emit_pre_lto_bc` error as well.)

0 files changed, 0 insertions, 0 deletions