Disable a C++ interop test: use-std-span.swift

rdar://147269070 (SILGen generates invalid SIL for
Interop/Cxx/stdlib/use-std-span.swift)

This test now generates invalid SIL out of SILGen:

SIL verification failed: stack dealloc does not match most recent stack alloc: op == state.Stack.back()
Verifying instruction:
     %4 = alloc_stack $std.__1.span<__cxxConst<CInt>, _CUnsignedLong_18446744073709551615> // users: %33, %28, %27
->   dealloc_stack %4 : $*std.__1.span<__cxxConst<CInt>, _CUnsignedLong_18446744073709551615> // id: %33

Author: atrick

test/Interop/Cxx/stdlib/use-std-span.swift

@@ -659,6 +659,10 @@ StdSpanTestSuite.test("Span as arg to generic func") {
   accessSpanAsSomeGenericParam(sspan)
 }
 
+/*
+ DISABLED: rdar://147269070
+ (SILGen generates invalid SIL for Interop/Cxx/stdlib/use-std-span.swift)
+
 StdSpanTestSuite.test("Convert between Swift and C++ span types")
 .require(.stdlib_6_2).code {
   guard #available(SwiftStdlib 6.2, *) else { return }
@@ -688,5 +692,6 @@ StdSpanTestSuite.test("Convert between Swift and C++ span types")
     }
   }
 }
+ */
 
 runAllTests()