Run rustfmt on tests/codegen/.

Except for `simd-intrinsic/`, which has a lot of files containing
multiple types like `u8x64` which really are better when hand-formatted.

There is a surprising amount of two-space indenting in this directory.

Non-trivial changes:
- `rustfmt::skip` needed in `debug-column.rs` to preserve meaning of the
  test.
- `rustfmt::skip` used in a few places where hand-formatting read more
  nicely: `enum/enum-match.rs`
- Line number adjustments needed for the expected output of
  `debug-column.rs` and `coroutine-debug.rs`.

tests/codegen/float_math.rs

@@ -3,48 +3,40 @@
 #![crate_type = "lib"]
 #![feature(core_intrinsics)]
 
-use std::intrinsics::{fadd_fast, fsub_fast, fmul_fast, fdiv_fast, frem_fast};
+use std::intrinsics::{fadd_fast, fdiv_fast, fmul_fast, frem_fast, fsub_fast};
 
 // CHECK-LABEL: @add
 #[no_mangle]
 pub fn add(x: f32, y: f32) -> f32 {
-// CHECK: fadd float
-// CHECK-NOT: fast
+    // CHECK: fadd float
+    // CHECK-NOT: fast
     x + y
 }
 
 // CHECK-LABEL: @addition
 #[no_mangle]
 pub fn addition(x: f32, y: f32) -> f32 {
-// CHECK: fadd fast float
-    unsafe {
-        fadd_fast(x, y)
-    }
+    // CHECK: fadd fast float
+    unsafe { fadd_fast(x, y) }
 }
 
 // CHECK-LABEL: @subtraction
 #[no_mangle]
 pub fn subtraction(x: f32, y: f32) -> f32 {
-// CHECK: fsub fast float
-    unsafe {
-        fsub_fast(x, y)
-    }
+    // CHECK: fsub fast float
+    unsafe { fsub_fast(x, y) }
 }
 
 // CHECK-LABEL: @multiplication
 #[no_mangle]
 pub fn multiplication(x: f32, y: f32) -> f32 {
-// CHECK: fmul fast float
-    unsafe {
-        fmul_fast(x, y)
-    }
+    // CHECK: fmul fast float
+    unsafe { fmul_fast(x, y) }
 }
 
 // CHECK-LABEL: @division
 #[no_mangle]
 pub fn division(x: f32, y: f32) -> f32 {
-// CHECK: fdiv fast float
-    unsafe {
-        fdiv_fast(x, y)
-    }
+    // CHECK: fdiv fast float
+    unsafe { fdiv_fast(x, y) }
 }