Setting hardcode SWIFT_NOEXCEPT and noexcept flags only to

non-throwing functions.
Activating swift-functions-errors tests
Inserting macros and additional parameters in C and C++ functions following the pattern to lowering to LLVM IR.

test/Interop/SwiftToCxx/functions/swift-functions-errors-execution.cpp

@@ -9,7 +9,6 @@
 // RUN: %target-run %t/swift-functions-errors-execution | %FileCheck %s
 
 // REQUIRES: executable_test
-// XFAIL: *
 
 #include <cassert>
 #include "functions.h"
@@ -24,4 +23,4 @@ int main() {
 }
 
 // CHECK: passEmptyThrowFunction
-// CHECK-NEXT: passThrowFunction
+// CHECK-NEXT: passThrowFunction