Release Cosmopolitan v3.3

This change upgrades to GCC 12.3 and GNU binutils 2.42. The GNU linker
appears to have changed things so that only a single de-duplicated str
table is present in the binary, and it gets placed wherever the linker
wants, regardless of what the linker script says. To cope with that we
need to stop using .ident to embed licenses. As such, this change does
significant work to revamp how third party licenses are defined in the
codebase, using `.section .notice,"aR",@progbits`.

This new GCC 12.3 toolchain has support for GNU indirect functions. It
lets us support __target_clones__ for the first time. This is used for
optimizing the performance of libc string functions such as strlen and
friends so far on x86, by ensuring AVX systems favor a second codepath
that uses VEX encoding. It shaves some latency off certain operations.
It's a useful feature to have for scientific computing for the reasons
explained by the test/libcxx/openmp_test.cc example which compiles for
fifteen different microarchitectures. Thanks to the upgrades, it's now
also possible to use newer instruction sets, such as AVX512FP16, VNNI.

Cosmo now uses the %gs register on x86 by default for TLS. Doing it is
helpful for any program that links `cosmo_dlopen()`. Such programs had
to recompile their binaries at startup to change the TLS instructions.
That's not great, since it means every page in the executable needs to
be faulted. The work of rewriting TLS-related x86 opcodes, is moved to
fixupobj.com instead. This is great news for MacOS x86 users, since we
previously needed to morph the binary every time for that platform but
now that's no longer necessary. The only platforms where we need fixup
of TLS x86 opcodes at runtime are now Windows, OpenBSD, and NetBSD. On
Windows we morph TLS to point deeper into the TIB, based on a TlsAlloc
assignment, and on OpenBSD/NetBSD we morph %gs back into %fs since the
kernels do not allow us to specify a value for the %gs register.

OpenBSD users are now required to use APE Loader to run Cosmo binaries
and assimilation is no longer possible. OpenBSD kernel needs to change
to allow programs to specify a value for the %gs register, or it needs
to stop marking executable pages loaded by the kernel as mimmutable().

This release fixes __constructor__, .ctor, .init_array, and lastly the
.preinit_array so they behave the exact same way as glibc.

We no longer use hex constants to define math.h symbols like M_PI.

third_party/compiler_rt/comprt.S

@@ -7,12 +7,8 @@ huge_compiler_rt_license:
 	.endobj	huge_compiler_rt_license,globl,hidden
 	.previous
 
-.ident "\n
-compiler_rt (Licensed MIT)
-Copyright (c) 2009-2015 by the contributors listed in:
-github.com/llvm-mirror/compiler-rt/blob/master/CREDITS.TXT"
-
-.ident "\n
+	.section .notice,"aR",@progbits
+	.asciz	"\n\n\
 compiler_rt (Licensed \"University of Illinois/NCSA Open Source License\")
 Copyright (c) 2009-2018 by the contributors listed in:
 github.com/llvm-mirror/compiler-rt/blob/master/CREDITS.TXT

third_party/compiler_rt/cpu_model.h

@@ -1,33 +0,0 @@
-//===-- cpu_model_common.c - Utilities for cpu model detection ----*- C -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-//  This file implements common utilities for runtime cpu model detection.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef COMPILER_RT_LIB_BUILTINS_CPU_MODEL_COMMON_H
-#define COMPILER_RT_LIB_BUILTINS_CPU_MODEL_COMMON_H
-
-#if __has_attribute(constructor)
-#if __GNUC__ >= 9
-// Ordinarily init priorities below 101 are disallowed as they are reserved for
-// the implementation. However, we are the implementation, so silence the
-// diagnostic, since it doesn't apply to us.
-#pragma GCC diagnostic ignored "-Wprio-ctor-dtor"
-#endif
-// We're choosing init priority 90 to force our constructors to run before any
-// constructors in the end user application (starting at priority 101). This
-// value matches the libgcc choice for the same functions.
-#define CONSTRUCTOR_ATTRIBUTE __attribute__((__constructor__(90)))
-#else
-// FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that
-// this runs during initialization.
-#define CONSTRUCTOR_ATTRIBUTE
-#endif
-
-#endif

third_party/compiler_rt/ilogbl.c

@@ -30,11 +30,7 @@
 #include "libc/tinymath/internal.h"
 #include "libc/tinymath/ldshape.internal.h"
 #if !(LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024)
-
-asm(".ident\t\"\\n\\n\
-Musl libc (MIT License)\\n\
-Copyright 2005-2014 Rich Felker, et. al.\"");
-asm(".include \"libc/disclaimer.inc\"");
+__static_yoink("musl_libc_notice");
 
 /**
  * Returns log₂𝑥 exponent part of double.

third_party/compiler_rt/logbl.c

@@ -27,11 +27,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/math.h"
 #if !(LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024)
-
-asm(".ident\t\"\\n\\n\
-Musl libc (MIT License)\\n\
-Copyright 2005-2014 Rich Felker, et. al.\"");
-asm(".include \"libc/disclaimer.inc\"");
+__static_yoink("musl_libc_notice");
 
 long double logbl(long double x)
 {