fix regression with zero sized array

BRANCH_TODO file moved to the pull request comments

fix loops with multiple break statements

fix coroutines

one more test passing

fix peer result loc fn call with comptime condition

fix labeled break inside comptime if inside runtime if

fix double getelementptr of runtime global

Merge remote-tracking branch 'origin/master' into copy-elision-3

fix optional pointer to size zero struct

fix `try` not setting error code on result location

fix comptime test error for empty error set

fix extraneous nested union field instruction

fix detection of unable to evaluate constant expression

fix comptime modification of const struct field

fix inline loop behavior with variable result loc

back to many behavioral tests passing

fix problem with inferred error set return result

fix bitcast

more miscellaneous fixes

fix zero length array literal casted to slice

misc fixes

inferred comptime array inits

fix function calls

inferred comptime union inits

inferred comptime values rather than elided scopes

better result location handling of inline loops

better result location semantics with optionals and return locations

Merge remote-tracking branch 'origin/master' into copy-elision-3

uncomment more passing tests

fix peer result locs with switch

fix peer result location with error code and payload

fix a couple more test regressions

fix bitcast packed struct to integer and back

fix atomic builtin functions

allow comptime array literals casted to slices

fix behavior for nested array literals

fix runtime initialize array elem and then implicit cast to slice

comment out the behavior tests that are failing

fix result loc implicit casting optionals and error unions

fix double nested peer result locations

fix declref not writing to result loc

fix nested peer result locs with no memory loc

fix `@bitCast` with runtime scalar and dest result loc var

fix alignment problem with `@bitCast` result location

fix `@bitCast` regressions

fix runtime if nested inside comptime if

fix returning scalar values

fix `@bitCast` semantics when there is no parent result loc

temporarily simplify test_runner.zig

fix for loop index variable not in scope

fix not checking return value of resolving result

fix struct and array init when result casted to anyerror!?T

fix struct and array init when result casted to anyerror!?T

fix implicit casting return value struct/arary init to optional

fixes for crashes and compile errors

fix comptime variables

fix comptime function calls

Merge remote-tracking branch 'origin/master' into copy-elision-3

remove the final legacy stack allocation

use result loc for ref instruction

fix peer result locations in the face of unreachable

result location semantics for vector to array

result loc semantics for loading packed struct pointer to packed struct

result loc semantics for `@sliceToBytes` and `@bytesToSlice`

result location semantics for cmpxchg

result location semantics for error union wrapping an error

result location semantics for error union wrapping a payload

result location semantics for optional wrap

result location semantics for slices

result location semantics for `@bitCast`

hook up result locations for union initializations

inferred array size of array literals works

Merge remote-tracking branch 'origin/master' into copy-elision-3

result loc semantics for array initialization

remove ResultLocField dead code

result location mechanism for struct initialization

hook up result locs for `try`

hook up peer result locs to orelse keyword

hook up peer result locs to catch

hook up result locs to for loops

hook up peer result locs to while bool and optional

hook up while on error unions with result locations

hook up peer result locs to if optional and if err

fix behavior for peer result locs with one prong unreachable

fix behavior for non sret fn calls

no-copy semantics for peer result function calls

no-copy semantics for switch expressions

fix the rest of the ir_build_alloca_src callsites

no-copy semantics for if optional and if error union

no-copy semantics for for loops

while loops

fix alignment of consts

var types, alignment, and comptime

add missing ir_expr_wrap calls

no-copy semantics for function forwarding

no-copy semantics for function call init var and literal

peer result locations with mixed runtime/comptime

local consts with comptime init exprs

no-copy semantics for nested if