build: move package sources from src/pkg to src

Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.

src/unsafe/unsafe.go

@@ -0,0 +1,37 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+	Package unsafe contains operations that step around the type safety of Go programs.
+*/
+package unsafe
+
+// ArbitraryType is here for the purposes of documentation only and is not actually
+// part of the unsafe package.  It represents the type of an arbitrary Go expression.
+type ArbitraryType int
+
+// Pointer represents a pointer to an arbitrary type.  There are four special operations
+// available for type Pointer that are not available for other types.
+//	1) A pointer value of any type can be converted to a Pointer.
+//	2) A Pointer can be converted to a pointer value of any type.
+//	3) A uintptr can be converted to a Pointer.
+//	4) A Pointer can be converted to a uintptr.
+// Pointer therefore allows a program to defeat the type system and read and write
+// arbitrary memory. It should be used with extreme care.
+type Pointer *ArbitraryType
+
+// Sizeof returns the size in bytes occupied by the value v.  The size is that of the
+// "top level" of the value only.  For instance, if v is a slice, it returns the size of
+// the slice descriptor, not the size of the memory referenced by the slice.
+func Sizeof(v ArbitraryType) uintptr
+
+// Offsetof returns the offset within the struct of the field represented by v,
+// which must be of the form structValue.field.  In other words, it returns the
+// number of bytes between the start of the struct and the start of the field.
+func Offsetof(v ArbitraryType) uintptr
+
+// Alignof returns the alignment of the value v.  It is the maximum value m such
+// that the address of a variable with the type of v will always be zero mod m.
+// If v is of the form structValue.field, it returns the alignment of field f within struct object obj.
+func Alignof(v ArbitraryType) uintptr