Build: Move from using C++11 to C++14.

Bug: b/147359661
Change-Id: Ieb2de4d93ca617b190977e258023992f4a6d34c9
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39948
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

.vscode/c_cpp_properties.json

diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
index 7c0fbac..18d6a18 100644
--- a/.vscode/c_cpp_properties.json
+++ b/.vscode/c_cpp_properties.json
@@ -18,7 +18,7 @@
                 "${workspaceFolder}/third_party/cppdap/include"
             ],
             "cStandard": "c11",
-            "cppStandard": "c++11"
+            "cppStandard": "c++14"
         },
         {
             "name": "Mac",
@@ -38,7 +38,7 @@
                 "${workspaceFolder}/third_party/cppdap/include"
             ],
             "cStandard": "c11",
-            "cppStandard": "c++11"
+            "cppStandard": "c++14"
         },
         {
             "name": "Win32",
@@ -58,7 +58,7 @@
                 "${workspaceFolder}/third_party/cppdap/include"
             ],
             "cStandard": "c11",
-            "cppStandard": "c++11"
+            "cppStandard": "c++14"
         }
     ],
     "version": 4

Android.bp

diff --git a/Android.bp b/Android.bp
index a48bb4f..9ac0441 100644
--- a/Android.bp
+++ b/Android.bp
@@ -32,7 +32,7 @@
         "-DVK_USE_PLATFORM_ANDROID_KHR",
 	"-DVK_EXPORT= ",
     ],
-    cpp_std: "c++11",
+    cpp_std: "c++14",
 
     target: {
         host: {

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
index 655cfad..a32cf80 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -60,7 +60,7 @@
     }
   } else {
     cflags = [
-      "-std=c++11",
+      "-std=c++14",
       "-fno-exceptions",
       "-fno-operator-names",
     ]

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f27ee1e..2b0f1e4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 3.6.3)
 
+set(CMAKE_CXX_STANDARD 14)
+
 project(SwiftShader C CXX ASM)
 
 # On Windows we use custom solution and project files, except for certain third-
@@ -360,7 +362,6 @@
     )
 
 else()
-    set_cpp_flag("--std=c++11")
     set_cpp_flag("-fno-exceptions")
 
     list(APPEND SWIFTSHADER_COMPILE_OPTIONS