update clang headers to 8.0.0rc2

LLD patch: workaround for buggy MACH-O code

update embedded LLD to 8.0.0rc2

build: update Findllvm.cmake for llvm 8

build: make sure LLVM is exactly correct

Merge remote-tracking branch 'origin/master' into llvm8

fix vector debug info tripping LLVM assertion

Merge remote-tracking branch 'origin/master' into llvm8

update to llvm8 trunk. all tests passing

Merge remote-tracking branch 'origin/master' into llvm8

Merge remote-tracking branch 'origin/master' into llvm8

Merge remote-tracking branch 'origin/master' into llvm8

translate-c: update to llvm8

Merge remote-tracking branch 'origin/master' into llvm8

self-hosted: add hurd os to switch

llvm8: fix ZigLLVMCreateFunction

test: remove type info test dependency on builtin.Os enum

llvm8: fix build errors

Merge remote-tracking branch 'origin/master' into llvm8

Merge remote-tracking branch 'origin/master' into llvm8

fix broken cli test and translate-c: support no-op cast

update type info behavior test

update self-hosted compiler for new targets

update to build against llvm trunk

update ci scripts for llvm 8

Merge remote-tracking branch 'origin/master' into llvm8

add HermitCore target

update to llvm 8

travis: build zig with gcc to match what llvm was built with

build: fix finding llvm and clang 7

travis: fix llvm apt package names

fix typo from previous commit

travis: fix package names

travis: update apt repo url

appveyor: remove old cache file

Merge remote-tracking branch 'origin/llvm7'

std/index.zig: Fix import

fix regression from previous commit

zig fmt: handle shebang lines

fix optional pointer to empty struct incorrectly being non-null

add compile error for slice.*.len

stage1 caching: don't write manifest until cache release

implementation for bitcasting extern enum type to c_int

fix implicit cast of packed struct field to const ptr

fix @embedFile reading garbage memory

minor cleanups from 68c1d05917

fix @bytesToSlice on a packed struct

compiling on mingw is now supported (#1542)

link to #1544

Merge pull request #1543 from ziglang/bit_shifting

fix codegen for @intCast to u0

remove deprecated, unused windows functions

add compile error for @ptrCast 0 bit type to non-0 bit type

add compile error for non-optional types compared against null

fix crash when bit shifting a u1

dereferencing a *u0 is comptime-known to be 0

remove `zig build --init`. add `zig init-lib` and `zig init-exe`

allow extern structs to have stdcallcc function pointers

fix crash when pointer casting a runtime extern function

add docs for `@This()`

fix alignment of structs

fix coroutine alignment

Fix additional regressions calling FileOutStream/FileInStream init()

docs: more syntax highlighting

fix tagged union with all void payloads but meaningful tag

fix assertion failure on compile-time `@intToPtr` of function

remove `this`. add `@This()`.

remove the scope parameter of setFloatMode

stage1: put test output artifact back in zig-cache folder

add compile error for merging non- error sets

fix tagged union with only 1 field tripping assertion

appveyor: skip all release tests to save time

Merge branch 'kristate-cache-invalidformat-issue1510'

math/complex: cexp test correction and ldexp usage fix

appveyor: skip release-safe to save time

docs: langref is now javascript-free

ci: skip release-small tests to save time

fix zig fmt on windows

windows: std.fs functions support concurrent ops

Merge pull request #1494 from ziglang/stage1-caching

Merge pull request #1506 from emekoi/master

ci: build zig in release mode

fix incorrect error union const value generation

fix incorrect union const value generation

disable stage2 tests on all targets

fix llvm assertion and missing compile error

Add capacity and appendAssumeCapacity to ArrayList

Merge pull request #1488 from Sahnvour/windows-resolve-path

improve panic message from previous commit

C ABI: support returning large structs on x86_64

C ABI: support medium size structs & unions for x86_64 params

stage1: function to classify x86_64 abi types

fix crash when var init has compile error

Merge branch 'c-abi'

Merge pull request #1480 from kristate/x25519-pubkey-fix

stage1: improve handling of generic fn proto type expr

add compile error for using outer scoped runtime variables

stage1: rename more TypeTableEntry types to ZigType

stage1: rename VariableTableEntry to ZigVar

stage1: rename FnTableEntry to ZigFn