[test] Make bindings-build-record.swift cross-time-zone-compatible.

This is a Driver test that relies on being able to refer to particular seconds.
Previously it (accidentally) relied on 'touch' acting in Pacific time.

Fixes https://bugs.swift.org/browse/SR-31 and rdar://problem/23382722.

Author: jrose-apple

test/Driver/Dependencies/Inputs/touch.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+
+# Like /bin/touch, but takes a time using the LLVM epoch.
+
+import os
+import sys
+
+assert len(sys.argv) >= 2
+timeVal = int(sys.argv[1])
+
+timeVal += 946684800 # offset between Unix and LLVM epochs
+
+# Update the output file mtime, or create it if necessary.
+# From http://stackoverflow.com/a/1160227.
+for outputFile in sys.argv[1:]:
+  with open(outputFile, 'a'):
+    os.utime(outputFile, (timeVal, timeVal))

test/Driver/Dependencies/bindings-build-record.swift

@@ -1,8 +1,5 @@
-// rdar://problem/21515673
-// REQUIRES: OS=macosx
-
 // RUN: rm -rf %t && cp -r %S/Inputs/bindings-build-record/ %t
-// RUN: touch -t 201401240005 %t/*
+// RUN: %S/Inputs/touch.py 443865900 %t/*
 
 // RUN: cd %t && %swiftc_driver -driver-print-bindings ./main.swift ./other.swift ./yet-another.swift -incremental -output-file-map %t/output.json 2>&1 | FileCheck %s -check-prefix=MUST-EXEC
 
@@ -32,13 +29,13 @@
 
 // FILE-ADDED: inputs: ["./added.swift"], output: {{[{].*[}]}}, condition: newly-added{{$}}
 
-// RUN: touch -t 201401240006 %t/main.swift
+// RUN: %S/Inputs/touch.py 443865960 %t/main.swift
 // RUN: cd %t && %swiftc_driver -driver-print-bindings ./main.swift ./other.swift ./yet-another.swift -incremental -output-file-map %t/output.json 2>&1 | FileCheck %s -check-prefix=BUILD-RECORD-PLUS-CHANGE
 // BUILD-RECORD-PLUS-CHANGE: inputs: ["./main.swift"], output: {{[{].*[}]}}, condition: run-without-cascading
 // BUILD-RECORD-PLUS-CHANGE: inputs: ["./other.swift"], output: {{[{].*[}]}}, condition: run-without-cascading{{$}}
 // BUILD-RECORD-PLUS-CHANGE: inputs: ["./yet-another.swift"], output: {{[{].*[}]$}}
 
-// RUN: touch -t 201401240005 %t/main.swift
+// RUN: %S/Inputs/touch.py 443865900 %t/*
 // RUN: cd %t && %swiftc_driver -driver-print-bindings ./main.swift ./other.swift -incremental -output-file-map %t/output.json 2>&1 | FileCheck %s -check-prefix=FILE-REMOVED
 // FILE-REMOVED: inputs: ["./main.swift"], output: {{[{].*[}]}}, condition: run-without-cascading
 // FILE-REMOVED: inputs: ["./other.swift"], output: {{[{].*[}]}}, condition: run-without-cascading