Remove hard-coding of -swift-version 3 in some validation tests.

Author: tkremenek

validation-test/IDE/crashers_2/0010-reference-to-self-in-extension-init.swift

@@ -1,4 +1,4 @@
-// RUN: not --crash %target-swift-ide-test -swift-version 3 -code-completion -code-completion-token=A -source-filename=%s
+// RUN: not --crash %target-swift-ide-test -code-completion -code-completion-token=A -source-filename=%s
 // REQUIRES: asserts
 
 extension Integer { 

validation-test/IDE/crashers_2/0011-complete-protocol-with-initializer.swift

@@ -1,4 +1,4 @@
-// RUN: not --crash %target-swift-ide-test -swift-version 3 -code-completion -code-completion-token=A -source-filename=%s
+// RUN: not --crash %target-swift-ide-test -code-completion -code-completion-token=A -source-filename=%s
 // REQUIRES: asserts
 
 Integer#^A^#

validation-test/Serialization/rdar29694978.swift

@@ -1,6 +1,6 @@
 // RUN: rm -rf %t && mkdir -p %t
-// RUN: %target-build-swift %s -swift-version 3 -import-objc-header %S/Inputs/rdar29694978.h -emit-module -o %t/Library.swiftmodule
-// RUN: %target-swift-ide-test -swift-version 3 -print-module -module-to-print=Library -source-filename=x -I %S/Inputs/ -I %t | %FileCheck %s
+// RUN: %target-build-swift %s -import-objc-header %S/Inputs/rdar29694978.h -emit-module -o %t/Library.swiftmodule
+// RUN: %target-swift-ide-test -print-module -module-to-print=Library -source-filename=x -I %S/Inputs/ -I %t | %FileCheck %s
 
 // REQUIRES: objc_interop