Revert "[CodeCompletion] Don't complete .members after a space"

It was pointed out to me that this syntax is legal (d'oh).  Maybe we
should delete the extra spaces when we insert the ".", but otherwise
this is working as-is.

This reverts commit 1878be2.

Author: benlangmuir

lib/IDE/CodeCompletion.cpp

@@ -2654,9 +2654,6 @@ class CompletionLookup final : public swift::VisibleDeclConsumer {
       if (HaveLParen)
         return;
 
-      if (HaveLeadingSpace && !HaveDot)
-        return;
-
       if (auto *VD = dyn_cast<VarDecl>(D)) {
         addVarDeclRef(VD, Reason);
         return;

test/IDE/complete_value_expr.swift

@@ -170,8 +170,6 @@
 // RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=GENERIC_TYPEALIAS_1 | FileCheck %s -check-prefix=GENERIC_TYPEALIAS_1
 // RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=GENERIC_TYPEALIAS_2 | FileCheck %s -check-prefix=GENERIC_TYPEALIAS_2
 
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=AFTER_SPACE_1 | FileCheck %s -check-prefix=AFTER_SPACE_1
-
 // Test code completion of expressions that produce a value.
 
 struct FooStruct {
@@ -1884,8 +1882,3 @@ func testGenericTypealias2() {
   Enclose.#^GENERIC_TYPEALIAS_2^#
 }
 // GENERIC_TYPEALIAS_2: Decl[TypeAlias]/CurrNominal:        MyPair[#(T, T)#];
-
-func testAfterSpace(x: Int?) {
-  x #^AFTER_SPACE_1^#
-// AFTER_SPACE_1-NOT: CurrNominal
-}

test/SourceKit/CodeComplete/complete_operators.swift

@@ -5,7 +5,6 @@
 // RUN: %complete-test -tok=OPT_OPERATORS %s | FileCheck %s -check-prefix=OPT
 // RUN: %complete-test -tok=KNOWN_OPERATORS_1 %s | FileCheck %s -check-prefix=KNOWN
 // RUN: %complete-test -tok=KNOWN_OPERATORS_2 %s | FileCheck %s -check-prefix=KNOWN
-// RUN: %complete-test -tok=NO_DOT %s | FileCheck %s -check-prefix=NO_DOT
 
 struct MyInt {
   var bigPowers: Int { return 1 }
@@ -168,11 +167,3 @@ func test6(x: DoesEverything) {
 // KNOWN: ===
 // KNOWN: !==
 // KNOWN: ~=
-
-func test7() {
-  var x: DoesEverything
-  x #^NO_DOT^#
-}
-// NO_DOT-NOT: .
-// NO_DOT: =
-// NO_DOT: ==