Toolchain+Ports: Update LLVM to 14.0.1

Besides a version bump, the following changes have been made to our
toolchain infrastructure:
- LLVM/Clang is now built with -march=native if the host compiler
  supports it. An exception to this is CI, as the toolchain cache is
  shared among many different machines there.
- The LLVM tarball is not re-extracted if the hash of the applied
  patches doesn't differ.
- The patches have been split up into atomic chunks.
- Port-specific patches have been integrated into the main patches,
  which will aid in the work towards self-hosting.
- <sysroot>/usr/local/lib is now appended to the linker's search path by
  default.
- --pack-dyn-relocs=relr is appended to the linker command line by
  default, meaning ports take advantage of RELR relocations without any
  patches or additional compiler flags.

The formatting of LLVM port's package.sh has been bothering me, so I
also indented the arguments to the CMake invocation.

Toolchain/Patches/llvm/0006-compiler-rt-Build-crtbegin.o-crtend.o-for-SerenityOS.patch

@@ -0,0 +1,25 @@
+From 1cf9ec98aa817c13b94b42e4df80804a6757aa8a Mon Sep 17 00:00:00 2001
+From: Daniel Bertalan <dani@danielbertalan.dev>
+Date: Thu, 14 Apr 2022 10:20:46 +0200
+Subject: [PATCH 6/8] [compiler-rt] Build crtbegin.o/crtend.o for SerenityOS
+
+---
+ compiler-rt/cmake/config-ix.cmake | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/compiler-rt/cmake/config-ix.cmake b/compiler-rt/cmake/config-ix.cmake
+index fc62d5ecc..7a47b7f71 100644
+--- a/compiler-rt/cmake/config-ix.cmake
++++ b/compiler-rt/cmake/config-ix.cmake
+@@ -696,7 +696,7 @@ endif()
+ 
+ # TODO: Add builtins support.
+ 
+-if (CRT_SUPPORTED_ARCH AND OS_NAME MATCHES "Linux" AND NOT LLVM_USE_SANITIZER)
++if (CRT_SUPPORTED_ARCH AND OS_NAME MATCHES "Linux|SerenityOS" AND NOT LLVM_USE_SANITIZER)
+   set(COMPILER_RT_HAS_CRT TRUE)
+ else()
+   set(COMPILER_RT_HAS_CRT FALSE)
+-- 
+2.35.3
+