Various improvements and tweaks to bring SwiftIfConfig in line with the compiler#2774

Merged

DougGregor merged 11 commits intoswiftlang:mainfrom

DougGregor:if-config-compiler-align

Aug 5, 2024

Commits on Aug 5, 2024

Implement warning to recognize conditions that should be simulator checks
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Slight changes in diagnostic wording to more closely match the compiler
DougGregor
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Downgrade the error about a `_compiler_version("1.N.2")` to a warning
DougGregor
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Downgrade error about bad "_endian" platform condition to a warning
DougGregor
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Introduce warning to rename targetEnvironment(macabi) to macCatalyst
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Properly translate import path expressions to an import path
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Ensure that we diagnose compound names where they shouldn't be
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Customize "unknown infix operator" diagnostic to make it clearer
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Only diagnostic likely targetEnvironment(simulator) conditions at the top level
DougGregor
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Avoid evaluating canImport when the result of the #if condition is known
DougGregor
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Slight diagnostics cleanup for incorrect infix and prefix operators
DougGregor
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