InternPool: fix more crashes

AIR: eliminate the `values` array

InternPool: fix enough crashes to run `build-obj` on a simple program

Module: intern the values of decls when they are marked alive

Sema: inferred allocations no longer abuse type/value system

Sema: fix some issues with the inferred alloc tag change

Air: remove constant tag

InternPool: fix crashes up to in progress comptime mutation

InternPool: remove more legacy values

InternPool: port most of value tags

InternPool: support int->comptime_int in getCoerced

Sema: update zirSliceLength to avoid resolveInst(.none)

Sema: improve the types_to_resolve mechanism

remove the kludges from std.builtin

llvm: fix incorrect slice lowering

InternPool: add lldb pretty printing for indices

Value: remove legacy type values

TypedValue: fix debug print crashes

InternPool: add missing logic

InternPool: fix logic bugs

InternPool: add more pointer values

InternPool: fix coersion issues

Type: hack around `isNoReturn` queries for the remaining legacy tags

InternPool: add missing ensureCapacity call with enums

Sema: move `inferred_alloc_const/mut_type` to InternPool

Module: remove tmp_hack_arena

compiler: remove var_args_param_type from SimpleType

Value: add `intern` and `unintern` to facilitate code conversion

Sema: port Value.decl_ptr to InternPool

Sema: port reify struct access to use InternPool

Sema: add coerceTupleToStruct result to the InternPool

InternPool: add repeated aggregate storage

compiler: move error union types and error set types to InternPool

compiler: eliminate legacy Type.Tag.pointer

compiler: eliminate legacy Type.Tag.optional

compiler: move `anyframe->T` to InternPool

stage2: move function types to InternPool

stage2: encode one-possible-value tuple specially

stage2: move anon tuples and anon structs to InternPool

stage2: move enum tag values into the InternPool

stage2: remove legacy Type array and array_sentinel

InternPool: transition float values

stage2: move enum types into the InternPool

InternPool: fix deinit leaking inner maps

InternPool: ability to encode enums

add std.hash.uint32

stage2: move union types and values to InternPool

stage2: move struct types and aggregate values to InternPool

stage2: move opaque types to InternPool

InternPool: add optional values

InternPool: add ptr-to-int value

InternPool: add indexToKey for empty struct types

Sema: introduce Value.enum_field_0

stage2: more InternPool related fixes

stage2: move empty struct type and value to InternPool

InternPool: add an int_u8 value encoding

stage2: more InternPool-related fixes

stage2: implement intTagType logic

stage2: bug fixes related to Type/Value/InternPool

InternPool: fix UAF in getCoercedInt and add u16 int value encoding

Replace uses of Value.zero, Value.one, Value.negative_one

InternPool: add getCoercedInt to avoid copy in Sema

wip: progress towards compiling tests

InternPool: implement indexToKey and equality for int values

InternPool: add an encoding for arrays with sentinels

stage2: move integer values to InternPool

Sema: update onePossibleValue for InternPool

LLVM backend: update integer constant lowering for InternPool

stage2: fix interned integer value printing

InternPool: fix bug in addLimbsExtraAssumeCapacity

Sema: add typeHasOnePossibleValue logic for InternPool

InternPool: add a slice encoding

stage2: add missing comptimeOnly logic for InternPool

fix AIR printing of interned constants

stage2: add tmp_hack_arena for the InternPool transition

fill out more InternPool Type methods

InternPool: add a dump function

stage2: migrate many pointer types to the InternPool

std.builtin.AddressSpace: allocate one more bit to this enum

Sema: update core comptime detection logic to be InternPool aware

InternPool: enhance integer values

std.mem.alignForwardGeneric: manually inline the assertions

stage2: add a few more Value checks for InternPool

stage2: move undef, unreach, null values to InternPool

InternPool: add the missing pointer data

stage2: move many Type encodings to InternPool

stage2: move all integer types to InternPool

Type.isSlice: make it InternPool aware

Type: update to use InternPool for some methods

stage2: move most simple values to InternPool

stage2: move most simple types to InternPool

stage2: move named int types to InternPool

stage2: move float types to InternPool

InternPool: implement isSinglePointer

InternPool: implement typePtrOrOptionalPtrTy

InternPool: implement resolveTypeFields

InternPool: implement hasWellDefinedLayout for simple_type

InternPool: implement hasRuntimeBitsAdvanced for simple_type

InternPool: implement typeHasOnePossibleValue for simple_type

stage2: isGenericPoison InternPool awareness