NFC: Re-organize NameBinding tests

The directory currently seems to have a mix of
tests for import resolution and name lookup.
Therefore split it into two directories;
ImportResolution and NameLookup.

Author: hamishknight

lib/AST/UnqualifiedLookup.cpp

@@ -1448,7 +1448,7 @@ bool UnqualifiedLookupFactory::shouldDiffer() const {
     "swift/test/TypeCoercion/overload_noncall.swift",
     "swift/test/expr/capture/nested_class.swift",
     "swift/test/expr/capture/order.swift",
-    "swift/test/NameBinding/name-binding.swift"
+    "swift/test/NameLookup/name_lookup2.swift"
   };
   StringRef fileName = SF->getFilename();
   return llvm::any_of(testsThatShouldDiffer, [&](const char *testFile) {

test/NameBinding/Inputs/ClangModuleWithOverlay/ClangModuleWithOverlay.h renamed to test/ImportResolution/Inputs/ClangModuleWithOverlay/ClangModuleWithOverlay.h

@@ -0,0 +1,6 @@
+public func funcOrVar() {}
+
+public struct SomeStruct {}
+public var someVar : () = ()
+
+public func overloadedFunc() {}

test/NameBinding/Inputs/ClangModuleWithOverlay/module.modulemap renamed to test/ImportResolution/Inputs/ClangModuleWithOverlay/module.modulemap

@@ -0,0 +1,6 @@
+public var funcOrVar : Int = Int()
+
+public struct SomeStruct {}
+public var someVar : () = ()
+
+public func overloadedFunc(x: Int) {}

test/NameBinding/Inputs/DeclsUsedWrongly.swift renamed to test/ImportResolution/Inputs/DeclsUsedWrongly.swift

@@ -26,7 +26,7 @@ var i: Int = b.my_identity()
 
 
 // CHECK-EXPANDED:      ***Complete scope map***
-// CHECK-EXPANDED-NEXT: ASTSourceFileScope {{.*}}, (uncached) [1:1 - 6{{.*}}:1] 'SOURCE_DIR{{[/\\]}}test{{[/\\]}}NameBinding{{[/\\]}}scope_map_top_level.swift'
+// CHECK-EXPANDED-NEXT: ASTSourceFileScope {{.*}}, (uncached) [1:1 - 6{{.*}}:1] 'SOURCE_DIR{{[/\\]}}test{{[/\\]}}NameLookup{{[/\\]}}scope_map_top_level.swift'
 // CHECK-EXPANDED-NEXT: |-NominalTypeDeclScope {{.*}}, [4:1 - 4:13]
 // CHECK-EXPANDED-NEXT:   `-NominalTypeBodyScope {{.*}}, [4:11 - 4:13]
 // CHECK-EXPANDED-NEXT: `-TopLevelCodeScope {{.*}}, [6:1 - 21:28]