stage2: fix File incorrectly freeing its Namespace

stage2: properly free Decl name

std: fix compile errors found by stage2 AstGen

AstGen: represent global variables directly

AstGen: implement extern variables

AstGen: implement function prototypes with alignment exprs

AstGen: fix comptime compile error source location

Sema: rename TZIR to AIR

Sema: skip analysis of empty enum blocks

AstGen: implement anytype struct fields

AstGen: implement comptime struct fields

std.enums: remove stuff for enums with field aliases

move behavior tests from test/stage1/ to test/

update behavior tests with respect to new builtin pkg

tests: prepare behavior tests for stage2

stage2: fix scanDecls not advancing the field bits

std: remove redundant comptime keyword

stage2: implement semantic analysis for functions and global vars

stage2: prepare for mainining Decl references to ZIR indexes

stage2: semaDecl properly analyzes the decl block

Sema: do not analyze test decls when not in test mode

stage2: implement #8364

std: remove redundant `comptime const`

AstGen: hook up hex float parsing to float literals

AstGen: function prototypes can have alignment

Merge remote-tracking branch 'origin/master' into stage2-whole-file-astgen

AstGen: fix function src hash not including body

link: fix compile error from previous commit

stage2: rewire the frontend driver to whole-file-zir

AstGen: improved handling of declarations

AstGen: implement opaque decls

stage2: pre-open ZIR cache dir handles

stage2: implement caching for ZIR code

AstGen: implement `@Vector`

stage2: move overflow builtin ZIR instructions to Extended

AstGen: parser ensures all suspend have blocks

AstGen: implement await and resume

Merge remote-tracking branch 'origin/master' into stage2-whole-file-astgen

stage2: better error reporting for LazySrcLoc.entire_file

AstGen: support struct init with ref result location

stage2: remove call_none and call_none_chkused ZIR

stage2: remove dead ZIR instructions

AstGen: emit nosuspend function calls

AstGen: implement nosuspend expressions

AstGen: implement suspend blocks

stage2: implement `anyframe`, `anyframe->T` and fix assembly

AstGen: compile error for unable to infer array size

std: remove `comptime const`

AstGen: implement integers bigger than u64

stage2: write out builtin.zig before spawning AstGen tasks

ZIR: fix text printing of field_ptr_type

stage2: fix builtin.zig for `zig test`

std: fix potential bug in parseInt

std: fix compile errors caught by stage2 AstGen

delete packed enums from the language

AstGen: implement align and linksection on globals

std: fix compile errors caught by stage2 AstGen

AstGen: implement `@extern` builtin

AstGen: fix `@export`

AstGen: implement function prototypes

AstGen: implement alignment on locals

AstGen: implement comptime locals

AstGen: fix switch result location elision

AstGen: implement `@bitCast` for other result location types

AstGen: fix `@floatCast` having wrong arity

AstGen: slightly better eager-allocating heuristic

AstGen: implement union decls

AstGen: implement size zero inferred length arrays

AstGen: fix store_to_block_ptr elision for switch statements

std.fs: delete unused label

AstGen: implement for loop payload

AstGen: implement anytype parameters

AstGen: implement defer for `break`

AstGen: implement defer for `continue`

AstGen: basic defer implementation

stage2: make std.fmt.parseInt ignore `_`

stage2: fix compile error in codegen

AstGen: `try` fixups

stage2: astgen `try`

AstGen: implement array initialization expressions

stage2: make `@alignCast` accept 2 parameters

AstGen: implement inline asm output

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