std.os.linux: Rename start_pie.zig to pie.zig.

This just reflects the name it's actually exposed with in code.

Author: alexrp

lib/std/os/linux.zig

@@ -115,7 +115,7 @@ pub const user_desc = arch_bits.user_desc;
 pub const getcontext = arch_bits.getcontext;
 
 pub const tls = @import("linux/tls.zig");
-pub const pie = @import("linux/start_pie.zig");
+pub const pie = @import("linux/pie.zig");
 pub const BPF = @import("linux/bpf.zig");
 pub const IOCTL = @import("linux/ioctl.zig");
 pub const SECCOMP = @import("linux/seccomp.zig");

lib/std/os/linux/start_pie.zig renamed to lib/std/os/linux/pie.zig

@@ -288,8 +288,8 @@ fn _start() callconv(.Naked) noreturn {
             ,
             .csky =>
             // The CSKY ABI assumes that `gb` is set to the address of the GOT in order for
-            // position-independent code to work. We depend on this in `std.os.linux.start_pie`
-            // to locate `_DYNAMIC` as well.
+            // position-independent code to work. We depend on this in `std.os.linux.pie` to locate
+            // `_DYNAMIC` as well.
             \\ grs t0, 1f
             \\ 1:
             \\ lrw gb, 1b@GOTPC