[3.1] IRGen: Don't try to emit non-global variables of imported inline c functions #6913
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The previous check would fail because isExternallyVisible() is false for local
static variables with internal linkage.
rdar://29937443
• Explanation: We would assert during IRGen of imported inline C functions which had a static local variable with the internal linkage attribute set because we would try to generate code for this local variable.
• Scope of Issue: Occurs in swift code that imports inline c functions which static local variables that are marked internal_linkage.
• Origination: Unknown (the code with the wrong check has been there since 2014)
• Risk: Low.
• Reviewed By: John McCall
• Testing: Swift CI