[CodePrinting] add printGuardBlock#798
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Mirror `printIfBlock` for Swift `guard <cond> else { … }` blocks, so
generators don't have to spell `printBraceBlock("guard \(cond) else")`
inline. Migrates the one existing call site in
`JNISwift2JavaGenerator+SwiftThunkPrinting.swift` to use it.
The condition is passed through verbatim — `guard` in Swift is written
without parentheses around the condition, and the condition often binds
(`let x = optional`) so wrapping it would be wrong.
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Mirror
printIfBlockfor Swiftguard <cond> else { … }blocks, so generators don't have to spellprintBraceBlock("guard \(cond) else")inline.