stage2 codegen

stage2 - add llvm bindings to create attributes with string values

stage1 codegen

Add build.zig and command line flags

Sema: coercion from error sets to `anyerror`

stage2: fixes to extern variables

Merge pull request #9954 from Snektron/shifts

elevate more passing tests

stage2: `@hasDecl` is passing

stage2: optional comparison and 0-bit payloads

stage2: make hasCodeGenBits() always true for pointers

std.os: another workaround for stage1 `@minimum` behavior

std.os: add workarounds for stage1 `@minimum` implementation

stage2 AArch64: move codegen to separate file

Adds tip about testing stdlib files to CONTRIBUTING.md (#9946)

Sat shl neg rhs (#9949)

Fix bug where std.math.asinh64 doesn't respect signedness for negative values (#9940)

std.os.windows: Fix typo (#9951)

stage2: LLVM backend: implement `wrap_optional` AIR

stage2: implement `@minimum` and `@maximum`, including vectors

stage2: improved union support

move behavior tests that are passing for stage2

stage2: improve handling of 0-bit types and arrays

stage2: remove use of `builtin.stage2_arch` workaround

stage2: implement opaque declarations

stage2: implement Sema for elemVal for comptime slice

Sema: implement comptime `coerce_result_ptr` and `alloc`

stage2: LLVM backend: fix crash adding alloca

macho: redo relocation handling and lazy bind globals

stage2: fix comptime stores and sentinel-terminated arrays

Merge pull request #9878 from pfgithub/patch-4

stage2: LLVM backend: fix var args function calls

stage2: support nested structs and arrays and sret

Merge pull request #9925 from mattbork/uniondecl-fixes

translate-c: fix logic for checking primitive names

rand: remove workaround for issue #1770

add test step to build.zig generated by init-exe (#9919)

Better documentation, use of `len` field instead of function, @bitSizeOf instead of meta.bitCout

stage2: add --debug-compile-errors CLI option

stage2: fix returning structs byval from functions

stage2: fix comptime_float negation

AstGen: make array literals work like struct literals

stage2: implement array literal with explicit type

print_zir.zig: fill in remaining stubs

GitHub: slight change of wording on the proposal issue template

GitHub: fix yaml issue with bug report template

GitHub: add issue templates for bugs and proposals

stage2: enum fixes

stage2: implement runtime `@intToEnum`

move tagged union behavior tests to the appropriate place

stage2: LLVM backend: miscompilation fixes

freestanding libc: don't rely on compiler_rt symbols we don't have yet

freestanding libc: export fmal

stage1: work around LLVM's buggy fma lowering

stage2: analyzeSliceLen on comptime slices

add support for f128 `@mulAdd`

migrate from `std.Target.current` to `@import("builtin").target`

stage2: fix comptime `@bitCast`

FileProtocol: add Reader, Writer, SeekableStream

zig test: Add a --test-no-exec flag.

ci drone: enable more testsuite

langref: Explain Zig Test

Merge pull request #9880 from squeek502/deflate-construct-errors

deflate.zig: check for distances past beginning of output stream

add phi constant

stage2: fix Type max/min int calculation

Merge pull request #9885 from Snektron/big-int-wrapping

Merge pull request #9882 from mattbork/astgen-cursor

C backend: improved Decl name lowering

C backend: fix lowering of struct types

C backend: fix lowering of struct, float, and slice constants

stage2: Type: fix eql impl for error unions

AstGen: fix `while` and `for` with unreachable bodies

AstGen: fix if, orelse, catch, with unreachable bodies

Merge pull request #9873 from SpexGuy/fix-struct-namespaces

Document some functions in std.math.

Merge pull request #9875 from g-w1/timestimes

Add zlib to needed libraries

build.zig: omit LLVMTableGen from the llvm lib list

build.zig: update list of LLVM libs

Merge branch 'llvm13'

Fix a typo in @ceil documentation.

stage2: implement array_init instruction (#9843)

Add error message to test runner for bad arguments

Add a panic handler to give better errors for crashes in sema

parse.zig: better c pointer prefix parsing, don't index out of bounds on eof

stage2: fix ELF linking to include compiler_rt

stage2: LLVM backend: properly set module target data

stage2: LLVM backend: implement struct type fwd decls

move some behavior tests to the "passing for stage2" section

Sema: generic function instantiations gain addrspace of owner Decl

stage2: put use_llvm and use_stage1 into the Module cache hash

stage2: enable building compiler_rt when using LLVM backend

stage2: implement `@clz` and `@ctz`

AstGen: improved logic for nodeMayNeedMemoryLocation

saturating arithmetic supports integers only

Merge pull request #9679 from travisstaloch/sat-arith-operators

stage2: more arithmetic support

deflate.zig: fix bits_left overflow at EndOfStream and @intCast truncation with empty Huffman table

improve panic hierarchy by always using builtin.panic