jextract: support Swift custom operators

[AbdAlRahmanGad]

#817

[ktoso]

This is very close, we just broke the FFM mode by accident:

/Users/runner/actions-runner/_work/swift-java/swift-java/Samples/SwiftJavaExtractFFMSampleApp/.build/plugins/outputs/swiftjavaextractffmsampleapp/MySwiftLibrary/destination/JExtractSwiftPlugin/Sources/MySwiftStruct+SwiftJava.swift:158:67: error: expected ',' separator
156 | @_cdecl("swiftjava_MySwiftLibrary_MySwiftStruct_==_lhs_rhs")
157 | public func swiftjava_MySwiftLibrary_MySwiftStruct_==_lhs_rhs(_ lhs: UnsafeRawPointer, _ rhs: UnsafeRawPointer) -> Bool {
158 |   return (lhs.assumingMemoryBound(to: MySwiftStruct.self).pointee MySwiftStruct.== rhs.assumingMemoryBound(to: MySwiftStruct.self).pointee)
    |                                                                   `- error: expected ',' separator
159 | }
160 | 

/Users/runner/actions-runner/_work/swift-java/swift-java/Samples/SwiftJavaExtractFFMSampleApp/.build/plugins/outputs/swiftjavaextractffmsampleapp/MySwiftLibrary/destination/JExtractSwiftPlugin/Sources/MySwiftStruct+SwiftJava.swift:158:67: error: expected ',' separator
156 | @_cdecl("swiftjava_MySwiftLibrary_MySwiftStruct_==_lhs_rhs")
157 | public func swiftjava_MySwiftLibrary_MySwiftStruct_==_lhs_rhs(_ lhs: UnsafeRawPointer, _ rhs: UnsafeRawPointer) -> Bool {
158 |   return (lhs.assumingMemoryBound(to: MySwiftStruct.self).pointee MySwiftStruct.== rhs.assumingMemoryBound(to: MySwiftStruct.self).pointee)
    |                                                                   `- error: expected ',' separator
159 | }
160 | 

the cdecl naming needs to be fixed to handle the == same as we desugar them elsewhere.

Fixes should be in ThunkNameRegistry.functionThunkName and FFMSwift2JavaGenerator+FunctionLowering.cdeclThunk, would you mind following up on this @AbdAlRahmanGad ?

[AbdAlRahmanGad]

looks like github actions are kinda down : https://www.githubstatus.com/

I'll re-push when it's resolved

[ktoso]

Ugh yeah seems gh is having issues.