Add a test that C functions with malformed import-as-member-property API notes don't crash.

Author: jckarter

test/APINotes/Inputs/broken-modules/BrokenAPINotes.apinotes

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+Name: BrokenAPINotes
+Functions:
+  - Name: ZXSpectrumGetAccumulator
+    SwiftName: 'getter:ZXSpectrum.accumulator(self:)'
+  - Name: ZXSpectrumSetAccumulator
+    SwiftName: 'setter:ZXSpectrum.accumulator(self:newValue:)'
+  - Name: ZXSpectrumGetRegister
+    SwiftName: 'getter:ZXSpectrum.register(self:which:)'
+  - Name: ZXSpectrumSetRegister
+    SwiftName: 'setter:ZXSpectrum.register(self:which:newValue:)'
+  - Name: ZXSpectrumGetMisnamedRegister
+    SwiftName: 'getter:ZXSpectrum.misnamedRegister(self:)'
+  - Name: ZXSpectrumSetMisnamedRegister
+    SwiftName: 'setter:ZXSpectrum.misnamedRegister(self:newValue:)'

test/APINotes/Inputs/broken-modules/BrokenAPINotes.h

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+typedef struct ZXSpectrum { unsigned char A, B, C, D, H, L; } ZXSpectrum;
+
+unsigned char ZXSpectrumGetAccumulator(const ZXSpectrum *self);
+void ZXSpectrumSetAccumulator(ZXSpectrum *self, unsigned char newValue);
+
+unsigned char ZXSpectrumGetRegister(const ZXSpectrum *self, int which);
+void ZXSpectrumSetRegister(ZXSpectrum *self, int which, unsigned char newValue);
+
+unsigned char ZXSpectrumGetMisnamedRegister(const ZXSpectrum *self, int which);
+void ZXSpectrumSetMisnamedRegister(ZXSpectrum *self, int which, unsigned char newValue);
+

test/APINotes/Inputs/broken-modules/module.modulemap

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+module BrokenAPINotes {
+  header "BrokenAPINotes.h"
+}

test/APINotes/broken-swift-name.swift

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+// RUN: %target-parse-verify-swift -I %S/Inputs/broken-modules
+import BrokenAPINotes
+
+func testBrokenSwiftName(x: inout ZXSpectrum) {
+  _ = x.accumulator
+  x.accumulator = 0
+
+  // The functions that import as `register`'s accessors have incorrect
+  // signatures for a getter or setter. Ensure we drop the import instead of
+  // forming an invalid property.
+  _ = x.register // expected-error{{has no member}}
+  x.register = 0 // expected-error{{has no member}}
+
+  _ = x.misnamedRegister // expected-error{{has no member}}
+  x.misnamedRegister = 0 // expected-error{{has no member}}
+}