inline-asm: Update for new style (#623)

* inline-asm: Update for new style

rust-lang/rust#73364 implemented support for
providing multiple lines of assembly as separate arguments to `asm!`;
update the blog post to use that new syntax, so that people who find it
will use that style as an example.

* inline-asm: Outdent

* inline asm: Update play link

posts/inside-rust/2020-06-08-new-inline-asm.md

@@ -94,17 +94,16 @@ fn main() {
  for value in 0..=1024u64 {
  let popcnt;
  unsafe {
- asm!("
- popcnt {popcnt}, {v}
- 2:
- blsi rax, {v}
- jz 1f
- xor {v}, rax
- tzcnt rax, rax
- stosb
- jmp 2b
- 1:
- ",
+ asm!(
+ "popcnt {popcnt}, {v}",
+ "2:",
+ "blsi rax, {v}",
+ "jz 1f",
+ "xor {v}, rax",
+ "tzcnt rax, rax",
+ "stosb",
+ "jmp 2b",
+ "1:",
  v = inout(reg) value => _,
  popcnt = out(reg) popcnt,
  out("rax") _, // scratch
@@ -117,7 +116,7 @@ fn main() {
 ```
 
 (You can [try this example on the
-playground](https://play.rust-lang.org/?version=nightly&mode=release&edition=2018&gist=38874735e48aa20289f23f5a3cbeae0c).
+playground](https://play.rust-lang.org/?version=nightly&mode=release&edition=2018&gist=894a407f0fe858559aa378edf6ec4801).
 Note that this code serves to demonstrate inline assembly, not to demonstrate
 an efficient implementation of any particular algorithm.)