.eh_frames may refer to the trampoline, but it is impossible to encode such a relocation. The optional relocation "self-referential" target is replaced with a better named mandatory argument. The value will be discarded in trampoline generation with the rest of the .eh_frame.
Remove read_info.rs entirely.
Add `to_compile_error` that converts a WasmResult into a Result<_, CompileError>, use it with `wptype_to_type`. This is a candidate for being moved into shared code.
Many functions had to change to deal with propagating CompileError.
The function prologue now skips the sret argument if there is one.
The function epilogue packs values before return.
Br/BrIf/BrTable/Block/Loop/If/Else/End are updated to support multiple values.
As part of this, `read_info::blocktype_to_type` is removed. `blocktype_to_types` and `blocktype_to_param_types` take its place.
CtxType::func is updated to cache and return attributes. The allows the caller to place 'sret' on the call site, even though it's present on the FunctionValue. This helps some utility functions that check the callsite for presence of sret.
This renames `func_sig_to_llvm` to `func_type_to_llvm` and deletes the old version in intrinsics::. The new version returns a list of attributes along with the type. Update callers to set these attributes on the function or call site.
Now that we apply three annotations to every user memory access, factor it out into a new function to apply them.
We do this for the load and stores, but not yet the atomicrmw's.
This removes its last connection to the implementation details of having a wasm_module, which we don't want to have to rely on when building trampolines.
There currently isn't a RelocationTarget for a trampoline function that refers to itself (none of been observed to done so yet), so we make the RelocationTarget optional.
