zig astgen: print instruction counts and byte sizes

AstGen: implement error set decls

AstGen: implement functions with inferred error sets

std.MultiArrayList: ensureUnusedCapacity/ensureTotalCapacity

AstGen: implement if optional, if error union

AstGen: implement while optional and while error union

AstGen: implement the remaining struct init ResultLoc forms

AstGen: implement all the builtin functions

AstGen: implement overflow arithmetic builtins

AstGen: implement simple enums and decls for enums

AstGen: fix compile error using wrong node/token function

stage2: make `@import` relative to the current file

AstGen: fix function decl astgen

build.zig: add a way to skip installing lib/ files

AstGen: implement global var decls

std: deprecate ensureCapacity, add two other capacity functions

stage2: use import list from ZIR to queue up more AstGen tasks

AstGen: store list of imports

ZIR: rename decl_val and decl_ref to remove redundant suffix

AstGen: require `@import` operand to be string literal

AstGen: put decls into blocks to be evaluated independently

stage2: AstGen improvements

AstGen: implement comptimeDecl, usingnamespaceDecl, testDecl

AstGen: implement global variable decls

fix new references to std.builtin that should have been std.Target

stage2: fix zir.zig => Zir.zig in CMakeLists.txt

stage2: preliminary reworking for whole-file-AstGen

stage2: rename zir to Zir

stage2: move zir.Code to become root level fields of zir.zig

stage2 start.zig: slight simplification

stage2: implement `@bitSizeOf`

stage2: implement comptime division

stage2: implement `@sizeOf`

stage2: implement non-trivial enums

stage2: improvements aimed at std lib integration

std: change `@import("builtin")` to `std.builtin`

stage2: remove redundant source hash

stage2: entry point via std lib and proper updated file detection

stage2: properly model miscellaneous failed tasks

ci: drone: disable stage2 tests

ci: windows: update to llvm 12 msvc tarball

ci: update macos tarball to llvm 12

build.zig: omit LLVMTableGen from llvm libs

build.zig: update llvm libs

ci: windows: proper flags to zig build

ci: windows: try the dev kit strategy

ci: windows: ranlib take 2

ci: windows: better -DCMAKE_RANLIB option

freebsd: disable failing test

ci: freebsd: don't try to compile with zig cc

ci: windows: use llvm-ar.exe from the tarball

ci: better handle of -mcpu

ci: better target triple and mcpu cmake args

ci: freebsd: set the target triple

ci: windows: install git

ci: freebsd: pass -DZIG_USE_LLVM_CONFIG=OFF

ci: aarch64-linux: disable run-translated-c tests

ci: windows: try using zig-bootstrap to build zig

ci: freebsd: update to llvm 12

ci: update drone CI to llvm 12

ci: update linux to llvm12 tarball

ci: macos-aarch64 update dep tarballs for llvm12

os/posix: handle ECONNRESET for write/writev

Merge remote-tracking branch 'origin/llvm12'

Merge pull request #8518 from akvadrako/doc-field-align

translate-c: wrap switch statements in a while (true) loop

Merge pull request #8517 from ziglang/zld-archive-fix

zld: cleanup redundant changes

zld: rebase to new naming conv for aarch64

zld: add x86_64 relocs

zld: save locals per TU

zld: differentiate between static and global in stabs

zld: streamline tags for Symbol

zld: fix indirect symtab

zld: fix rebase vs bind for GOT entries

zld: fix parsing debug info

zld: limit exports to just main entrypoint

zld: move parsing debug info into object

zld: add prelim support for locals

zld: flush MachO

zld: resolve target addresses for relocs

zld: resolve stubs and GOT entries

zld: migrate parts of main to new relocs

zld: preprocess relocs on arm64

zld: allocate addresses for global symbols

zld: store a single global symtab

zld: start work on reloc preprocessing

zld: allocate segments based on worst-case and upper-limit

zld: assume remaining undefs are from libSystem

zld: refactor object and archive parsing

zld: redo symbol resolution in objects

stage1: resolve builtin types and values via std.builtin

Merge pull request #8502 from xackus/std-docs

CI: update brew before installing pkgs

Merge pull request #8477 from joachimschmidt557/stage2-arm

Merge pull request #8497 from LemonBoy/some-ppc-fixes

Merge pull request #8483 from fengb/powerpc

azure: OnMasterSuccess dependsOn BuildMacOS_arm64

ci: remove superfluous linefeed from macos arm64

test: overhaul stack_trace testing