Change v128_{load,store} to be unaligned

This reflects the type signature where any arbitrary pointer can get
passed in.

Author: alexcrichton

crates/core_arch/src/wasm32/simd128.rs

@@ -290,7 +290,7 @@ extern "C" {
 #[cfg_attr(test, assert_instr(v128.load))]
 #[target_feature(enable = "simd128")]
 pub unsafe fn v128_load(m: *const v128) -> v128 {
-    *m
+    ptr::read_unaligned(m)
 }
 
 /// Load eight 8-bit integers and sign extend each one to a 16-bit lane
@@ -396,7 +396,7 @@ pub unsafe fn v128_load64_zero(m: *const u64) -> v128 {
 #[cfg_attr(test, assert_instr(v128.store))]
 #[target_feature(enable = "simd128")]
 pub unsafe fn v128_store(m: *mut v128, a: v128) {
-    *m = a;
+    ptr::write_unaligned(m, a);
 }
 
 /// Loads an 8-bit value from `m` and sets lane `L` of `v` to that value.